Going just by bands:
-Iron Maiden
-Deep Purple
-Led Zeppelin
-Avantasia
-Nightwish
-Helloween
-Ayreon
-Judas Priest
-Dream Theater
-Dungeon
Just to name a few.
Some of my favourite singers are:
-Bruce Dickinson
-Michael Kiske
-Tim Grose
-Rob Halford
-Ian Gillan
-Robert Plant
There's a lot more, but those came to my mind first. My taste generally skews towards metal and rock music, but I do listen to a lot of other stuff as well. Video game music for example takes up roughly half of my playlist.