My first post on this forum! I've been lurking for a while and finally decided to join. Here's my top male vocalists:
Steven Tyler - amazing range and power; voice hasn't faded much with age; very unique sound
Brandon Boyd (of Incubus) - incredible power and clarity in his voice; great falsetto
Eddie Vedder - like Steven, has an unreal range and power; good at switching between intense almost screamy vocals and more subdued vocals; vocal style was copied to death by numerous rock singers, most notably Scott Stapp
James Maynard Keenan (of Tool and A Perfect Circle) - decent power, but his main strength is showing incredible emotion and intensity in his singing; like Eddie Vedder, good at switching between loud and intense and more subdued
There are many more male singers that I do like and are excellent, but these four are probably the best for me. I find in general that male pop singers (like Michael Jackson, Elton John, Bruno Mars, and Justin Timberlake) have very likeable voices and have vocal skill no doubt, but just don't compare to these rock singers who exude so much power and emotion in their voices. I think there probably are R&B male singers who are comparable (Cee Lo Green, Luther Vandross), but I just don't know enough of their music to say definitively how their voices compare.