Origin: Claves originated from West African traditions, where similar wooden percussion instruments were used for rhythm and communication.

Cultural Transmission: They were brought to the Caribbean and Latin America by enslaved Africans, eventually becoming central to Afro-Cuban music.

Modern Emergence: In the 19th and early 20th centuries, claves became widely used in Cuban genres such as son, rumba, mambo, and salsa.

Musical Role: Claves provide the rhythmic foundation in Latin music, often dictating the structure through clave patterns like the son clave and rumba clave.

Instrument Design: Made of dense hardwood, claves are simple in form but produce a sharp, resonant sound that cuts through ensemble textures.

Introduction to Western Classical and Popular Music: In the early 20th century, claves began appearing in Western orchestral and popular compositions, often as part of the expanding percussion sections that included ethnic instruments.

Symbolic Value: Claves represent the African roots of Latin American music and became a musical and cultural symbol of Afro-Cuban identity.

Instrument Type: Castanets are idiophones (clapper-type percussion instruments), traditionally made of hardwood, ivory, or similar materials, played by striking two pieces together.

Cultural Origin: Castanets have ancient roots, likely brought to Spain by Phoenicians or Moors, evolving from similar instruments like crotala used in ancient Greece, Rome, and Egypt.

Flamenco and Spanish Folk Dance: Though present in folk music for centuries, castanets became closely associated with Spanish flamenco and escuela bolera dance styles by the late 19th and early 20th centuries.

Orchestral Adoption: In the early 1900s, castanets began appearing in Western classical music, used to evoke Spanish cultural flavor, often in orchestral works.

Prominent Composers:

1. Manuel de Falla prominently featured castanets in La vida breve (1903).

2. Isaac Albéniz included them in Castilla (1934).

3. Joaquín Rodrigo later composed dedicated works for concert castanets.

Concert Instrument Development: In the early 20th century, performers like Antonia Mercé and later Lucero Tena helped transition castanets from folk dance accompaniment to recognized solo percussion instruments.

Ethnic Significance: Castanets served as a symbol of Spanish identity and were part of a broader trend of incorporating ethnic instruments into Western concert music during the early 20th century.