Covers and mashups
Play a song again on new instruments, or put two songs together.
A cover
Musical hears the notes of each part and plays them again on instruments you can edit.
Rebuild this as a cover on real instruments
Strip it back to piano and voice
A mashup
Drop two songs. Musical matches their keys and tempos with as little change as it can, and lines up their sections.
Make a mashup of the two songs
Review the result like any change, then trim and move clips by hand until the joins feel right.