Game Development

I'm making a game about the 12 Greek Olympian gods. The idea is that Prometheus, the Titan who stole fire from the gods, instructs you, a duck, to travel to the realms of each god and steal their "fire" for the humans (e.g. mastery of the seas from Poseidon). It is a mix of platforming and puzzles where you can use the abilities of some of the nature deities (the four winds, Helios the all-seeing sun god, and Achelous the river god)

My question is, how should I make and/or get music for my game so that it fits with the theme of the game? Using something like Beepbox to make retro music doesn't really fit, so I'm a bit stuck. Is there a similar tool for making smooth/continuous music that doesn't require all too much musical abilities or is that not a thing? If there isn't, is there a place to find game music that's available for public use?

some screenshots for reference: (the first level is Dionysus, the god of wine and ecstasy)