I used to play that. Good game.

Preferred background music : Pink Floyd : Atom Heart Mother

In may case, Slashem with Revolution Void from (from Jamendo, better if you get it from Archive.org) Opened Paradise (from Magnatune).

The first it's Jazz with a bit of Electronics, making Nethack/Slashem's randomness notorious, and the second one it's for when I pick up the Doppleganger Monk race/role combo and I begin an slaughter down the dungeon.