I'm a bit surprised that here isn't a Super Smash Bros. Wavebank, so I request one myself.
1. Night - Fountain of Dreams
2. Eerie (Old Hell, Meteor, Blood Moon) - Norfair
3. Overworld Day - Full Steam Ahead
4. Boss 1 (Eye of Cthulhu, Eater of Worlds, Skeletron, Skeletron Prime, Old Goblin...