So you're playing it as an ambientsound but instead of chirping insects it's music?
If yes, then you really shouldn't do this as it's an annoyance to people who want to tamper with their volume settings. The "music" is affected by the Effects slider then so you can't turn it off/down/up in relation to the other sounds.
If someone wants to play his own music either by replacing the in-game music or just by turning it off and running a media player in the background he can't do that as your music would still be heard.
If someone wants to crank up the volume of the music in relation to the other sounds he can't do that and if someone wants to just turn the music down or off so he can hear the sounds better he can't do that either.
So don't do it.
There is a discussion about this
here.