...aaaand I'll start. Not to beat around the bush too long, I'm a big fan of metal. My tastes have somewhat evolved with time, and it's not the only music I listen to (I also really enjoy "classic" songs with lyrical qualities, stuff by Leonard Cohen and quite a lot of French bands or singers that probably won't ring a bell for most people here). But to me, music has almost always been something I go to when looking for a boost of energy.
Now the funny thing is (in my own eyes at least), my favourite bands are not the ones I listen to when working out. I really enjoy music that's both powerful and atmospheric, even dark and broody sometimes, but that's not really what I want to have in my ears when I'm getting tired and still want to get a few extra reps in.
So, my workout playlist has a lot of epic, melodic and powerful stuff, even though the bands that play that time of music can sometimes rely on pretty cheesy gimmicks, if I'm completely honest. It's hard for me to be 100% behind Amon Amarth, Sabaton or Beast in Black, for example, because... well... neither their lyrics nor their music are exactly subtle...
but when I want to feel in the mood for lifting iron, or my own weight, or running for more than 20 minutes, all while feeling heroic and able to go beyond my limits... well, you've got to hand it to them - they really do the trick.