For people with profound hearing loss, a cochlear implant (CI) is able to provide access to sounds that support speech perception. With current technology, most CI users obtain very good speech understanding in quiet listening environments. However, many CI users still struggle when listening to music. Efforts have been made to preprocess music for CI users and improve their music enjoyment. This work investigates potential modifications of instrumental music to make it more accessible for CI users. For this purpose, we used two datasets with varying complexity and containing individual tracks of instrumental music. The first dataset contained trios and it was newly created and synthesized for this study. The second dataset contained orchestral music with a large number of instruments. Bilateral CI users and normal hearing listeners were asked to remix the multitracks grouped into melody, bass, accompaniment, and percussion. Remixes could be performed in the amplitude, spatial, and spectral domains. Results showed that CI users preferred tracks being panned toward the right side, especially the percussion component. When CI users were grouped into frequent or occasional music listeners, significant differences in remixing preferences in all domains were observed.

The Classical period falls between the Baroque and the Romantic periods. [2] Classical music has a lighter, clearer texture than Baroque music, but a more varying use of musical form, which is, in simpler terms, the rhythm and organization of any given piece of music. It is mainly homophonic, using a clear melody line over a subordinate chordal accompaniment,[3] but counterpoint was by no means forgotten, especially in liturgical vocal music and, later in the period, secular instrumental music. It also makes use of style galant which emphasized light elegance in place of the Baroque's dignified seriousness and impressive grandeur. Variety and contrast within a piece became more pronounced than before and the orchestra increased in size, range, and power.

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The harpsichord was replaced as the main keyboard instrument by the piano (or fortepiano). Unlike the harpsichord, which plucks strings with quills, pianos strike the strings with leather-covered hammers when the keys are pressed, which enables the performer to play louder or softer (hence the original name "fortepiano," literally "loud soft") and play with more expression; in contrast, the force with which a performer plays the harpsichord keys does not change the sound. Instrumental music was considered important by Classical period composers. The main kinds of instrumental music were the sonata, trio, string quartet, quintet, symphony (performed by an orchestra) and the solo concerto, which featured a virtuoso solo performer playing a solo work for violin, piano, flute, or another instrument, accompanied by an orchestra. Vocal music, such as songs for a singer and piano (notably the work of Schubert), choral works, and opera (a staged dramatic work for singers and orchestra) were also important during this period.

In the middle of the 18th century, Europe began to move toward a new style in architecture, literature, and the arts, generally known as Neoclassicism. This style sought to emulate the ideals of Classical antiquity, especially those of Classical Greece.[4] Classical music used formality and emphasis on order and hierarchy, and a "clearer", "cleaner" style that used clearer divisions between parts (notably a clear, single melody accompanied by chords), brighter contrasts and "tone colors" (achieved by the use of dynamic changes and modulations to more keys). In contrast with the richly layered music of the Baroque era, Classical music moved towards simplicity rather than complexity. In addition, the typical size of orchestras began to increase,[4] giving orchestras a more powerful sound.

The remarkable development of ideas in "natural philosophy" had already established itself in the public consciousness. In particular, Newton's physics was taken as a paradigm: structures should be well-founded in axioms and be both well-articulated and orderly. This taste for structural clarity began to affect music, which moved away from the layered polyphony of the Baroque period toward a style known as homophony, in which the melody is played over a subordinate harmony.[4] This move meant that chords became a much more prevalent feature of music, even if they interrupted the melodic smoothness of a single part. As a result, the tonal structure of a piece of music became more audible.

Economic changes also had the effect of altering the balance of availability and quality of musicians. While in the late Baroque, a major composer would have the entire musical resources of a town to draw on, the musical forces available at an aristocratic hunting lodge or small court were smaller and more fixed in their level of ability. This was a spur to having simpler parts for ensemble musicians to play, and in the case of a resident virtuoso group, a spur to writing spectacular, idiomatic parts for certain instruments, as in the case of the Mannheim orchestra, or virtuoso solo parts for particularly skilled violinists or flutists. In addition, the appetite by audiences for a continual supply of new music carried over from the Baroque. This meant that works had to be performable with, at best, one or two rehearsals. Even after 1790 Mozart writes about "the rehearsal", with the implication that his concerts would have only one rehearsal.

Since there was a greater emphasis on a single melodic line, there was greater emphasis on notating that line for dynamics and phrasing. This contrasts with the Baroque era, when melodies were typically written with no dynamics, phrasing marks or ornaments, as it was assumed that the performer would improvise these elements on the spot. In the Classical era, it became more common for composers to indicate where they wanted performers to play ornaments such as trills or turns. The simplification of texture made such instrumental detail more important, and also made the use of characteristic rhythms, such as attention-getting opening fanfares, the funeral march rhythm, or the minuet genre, more important in establishing and unifying the tone of a single movement.

The Classical period also saw the gradual development of sonata form, a set of structural principles for music that reconciled the Classical preference for melodic material with harmonic development, which could be applied across musical genres. The sonata itself continued to be the principal form for solo and chamber music, while later in the Classical period the string quartet became a prominent genre. The symphony form for orchestra was created in this period (this is popularly attributed to Joseph Haydn). The concerto grosso (a concerto for more than one musician), a very popular form in the Baroque era, began to be replaced by the solo concerto, featuring only one soloist. Composers began to place more importance on the particular soloist's ability to show off virtuoso skills, with challenging, fast scale and arpeggio runs. Nonetheless, some concerti grossi remained, the most famous of which being Mozart's Sinfonia Concertante for Violin and Viola in E-flat major.

In the classical period, the theme consists of phrases with contrasting melodic figures and rhythms. These phrases are relatively brief, typically four bars in length, and can occasionally seem sparse or terse. The texture is mainly homophonic,[3] with a clear melody above a subordinate chordal accompaniment, for instance an Alberti bass. This contrasts with the practice in Baroque music, where a piece or movement would typically have only one musical subject, which would then be worked out in a number of voices according to the principles of counterpoint, while maintaining a consistent rhythm or metre throughout. As a result, Classical music tends to have a lighter, clearer texture than the Baroque. The classical style draws on the style galant, a musical style which emphasized light elegance in place of the Baroque's dignified seriousness and impressive grandeur.

Structurally, Classical music generally has a clear musical form, with a well-defined contrast between tonic and dominant[citation needed], introduced by clear cadences. Dynamics are used to highlight the structural characteristics of the piece. In particular, sonata form and its variants were developed during the early classical period and was frequently used. The Classical approach to structure again contrasts with the Baroque, where a composition would normally move between tonic and dominant and back again[citation needed], but through a continual progress of chord changes and without a sense of "arrival" at the new key. While counterpoint was less emphasised in the classical period, it was by no means forgotten, especially later in the period, and composers still used counterpoint in "serious" works such as symphonies and string quartets, as well as religious pieces, such as Masses.

The classical musical style was supported by technical developments in instruments. The widespread adoption of equal temperament made classical musical structure possible, by ensuring that cadences in all keys sounded similar. The fortepiano and then the pianoforte replaced the harpsichord, enabling more dynamic contrast and more sustained melodies. Over the Classical period, keyboard instruments became richer, more sonorous and more powerful.

While vocal music such as comic opera was popular, great importance was given to instrumental music. The main kinds of instrumental music were the sonata, trio, string quartet, quintet, symphony, concerto (usually for a virtuoso solo instrument accompanied by orchestra), and light pieces such as serenades and divertimentos. Sonata form developed and became the most important form. It was used to build up the first movement of most large-scale works in symphonies and string quartets. Sonata form was also used in other movements and in single, standalone pieces such as overtures. 0852c4b9a8

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