piece of music; musical number; track
Refers to an individual piece or track, often in the context of a concert, album, or playlist.
The next piece is Beethoven's 'Moonlight Sonata'.
Please tell me the track listing for this album.
program; set list; selection of music
Refers to the list or collection of pieces to be performed, such as a concert program or a curated selection.
The concert program has been announced.
Today's selection is mainly classical music.
For this concert, they chose a classical masterpiece as one of the pieces on the program.
They performed a popular piece at the hall.
The band decided on the set list before the rehearsal.
The organizers announced the concert's program in advance.