I always wondered if there was any people making any good 40k related music and boy was i right. Here are just a few examples: and this There is one band that i gotta say you should listen too and that HMkids. Hmkids is a Russian band that does a lot of 40k music in Russian and they do a few songs in English. Like a Ork song they made called "Ere We Go" and is now one of my favorite songs that i listen to daily. I listened to most of the Russian ones they made and i gotta say they are amazing. you should check them out on youtube, they have a lot of songs to pick from. There is one more band that i know of called Hammer of Faith "another Russian band" but you should look them up on youtube as well.