some music you can use

[nub_hat]

I dunno what exactly you are looking for but here are a few midis you can check out whenever. a bunch of different stuff and a few repeats with different instruments/tempo
https://www.dropbox.com/s/ydk67iqzok964ze/freedoomifyouwant.zip?dl=0

[Blastfrog]

I like this (though a few are rough), I hope we can assign the best ones fittingly to some levels.

[MrFlibble]

There are some nice pieces, however I couldn't but notice a tendency to repeat the same musical phrase (with occasional little variation) several times over (e.g. the start of fastlite.mid, i don't know.mid).

[nub_hat]

here is more stuff it is less repetitive
https://www.dropbox.com/s/p8z4jpp7v0kq2i1/music%202.zip?dl=0