Well it was already pretty obvious that I would suggest you Gowan :D! But you might not like it because it's old stuff xD... And it sounds old, you know, like 70s-80s music but since you want to try to stuff, try it :). I would also suggest Styx (of course xD) so anyway, here's a little list of songs you can start with (if you really want to try it) and if you like them just, you know, look for other songs... You know how Youtube works xD You can also search for live videos if you want, it sounds less old (and shows the awesome singing skills xD)! Ok I wrote "xD" a lot... probably because I'm talking about Gowan and Styx xD (hahah... -.-)!
Gowan:
A Criminal Mind
Dedication
All the Lovers in the World
Moonlight Desires
Forever One
Dancing on my Own Ground
STYX:
link
link
link
link
link
Blue Collar Man (starts around 1:15 on this video)
Grand Illusion (starts around 5:50 on this same video)
And here are some good other bands you might want to try...
SCORPIONS:
Still Loving You
Wind of Change
Hour 1
Humanity
DEF LEPPARD:
Photograph
Rock of Ages
Rock On
Foolin
RAINBOW:
Catch the Rainbow
Stargazer
Man on the Silver Mountain
Well, there are many more songs and many more bands I could suggest but I think it would kinda be too much xD! Actually, I think I wrote too much stuff already (sorry o3o)...
Anyway, tell me if you're interested in more bands or songs... Oh! And also, tell me what you think about it (even if you didn't like it, I just would like to know ^^). I put the links for the Styx videos because it's kind of hard to find good recent ones ;)
Sorry for the long text :S