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)
Trackers are a good fit for sample based music if you can get comfortable with the interface. OpenMPT and Renoise can even host VST plugins. You can get the samples on freesound.org and the plugins on plugins4free.
Reaper is a cheap DAW but it can be a bit overwhelming.
There's also BespokeSynth and SuperCollider although I don't know much about those.