Some of the first music I can remember got to be from the game called Rock'n Roll Racing I think, it had a music track that pretty much sounded like Ozzy with the song paranoid, slightly modified but it most likely were that song.
The next songs I can remember I enjoyed was Robby Williams with something I canot remember. Then, when I started to listen on music on a daily basis I remember I managed to tumble across the Iron Maiden concert in Rio, live on one of the national channels. Remember I sat up til far past bedtime and listened on the new and absolutely stunningly music.
So Iron Maiden was the first band that really got my interest for music, and after that and with time I started by various reasons, to hear on In Flames, Children of Bodom, Sonata Artica and Avenged Sevenfold (and other random power metall stuff) .