Selecting one song from an NSF

I'd like to use an NSF for background music, but there's only one song out of the NSF that I actually want to use. It has 6 songs, and I want to use the 4th. I don't know how, or if, I can select that song or if I would have to modify the NSF to play only that song.

Try MusicTrack = [song number you want in the NSF] in your level header. It's a parameter for selecting subtracks in music formats that support them, which I take it applies to NSF.