Music cannot add much to a game, and can easily remove a lot.
If one must add music, it should always avoid being too lively, or attention-grabbing, because players shouldn’t spend their attention on the music - it should be on the game.
Soundtracks often work well (nothing too recognizable). Game sounds should never have identifiable lyrics.
- Posy: Segmented Segments[i]
- Companions of Xanth[ii] (magnet)
- Terminator[iii] (magnet)
- Sound of a Cart[iv]
- Cave sounds[v]
- The Butt, by Bosch[vi]