US20080196575A1: 

"A novel process and system for presenting and displaying digital sheet music is disclosed. Digitized presentation of sheet music has been enjoyed by technology-savvy musicians and music aficionados for the past few years; however, nothing exists that extends this format into the realm beyond the personal computer, while also preserving the original sound of the master recording. The present invention is a system and process used to create a digital video of digital sheet music that is synchronized to an audio recording, and distributable to multiple media device platforms. The invention enables musicians and music aficionados to hear a song as it is meant to be heard—without synthetic MIDI overlays. The invention also allows the user to see the note being played by observing a real-time display of synchronized digital sheet music. The invention enables transfer of the media file to portable media devices or entertainment/gaming consoles." (Michael Good)

US11653167B2:

"A system for generating audio content in dependence upon an input audio track comprising audio corresponding to one or more sound sources, the system comprising an audio input unit operable to input the input audio track to one or more models, each representing one or more of the sound sources, and an audio generation unit operable to generate, using the one or more models, one or more audio tracks each comprising a representation of the audio contribution of the corresponding sound sources of the input audio track, wherein the generated audio tracks comprise one or more variations relative to the corresponding portion of the input audio track." (Fabio Cappello, Marina Villanueva-Barreiro, Oliver Hume)

US8541676B1:

"A method and computer based program which performs a series of steps for automatically and accurately determining each note played in a song for each instrument and vocal. The method and program can transcribe or create sheet music for each individual instrument, as well as provide the ability to remove any combination of or individual instruments or vocal track basically from nearly any existing song, or future songs." (Alexander Waldman)

Melody Scanner by Klangio:

"This Melody Scanner Service is copyright of © Melody Scanner 2022. All rights reserved. 

Record your Instrument: Bring your compositions to paper on the easiest way possible. Generate scores by recording your playing.

Upload MP3 files: Import Midi, MusicXML, or even MP3 files to your personal cloud songbook and access it from any device.

Import YouTube videos: Use our YouTube to Score feature to automatically generate sheet music from YouTube videos."

General:

Any audio or piece of music that is not the intellectual property of the user using the software may be subject to breaking copyright laws.

General:

Any audio or piece of music that is not the intellectual property of the user using the software may be subject to breaking trademark laws.