More people would know who he is if you posted this in the Popular Media section. Also, the OP is a bit confusing... Not trying to sound like a jerk, just want to help you out with any future posts.
You hear hoarse screaming, you hear guitar power chords who could it be of course Steven Tyler.
Okay.
Now that we've established that, what are we supposed to do? It seems a bit vague to just discuss "Steven Tyler". What are we discussing? His musical career? Aerosmith? His musical career without Aerosmith? The fact that he looks like he could be Angelina Jolie's grandmother?
Maybe we should discuss that hilarious accident where he accidentally hit his guitar friend on stage, Mr. Joe Perry, over the head with the microphone stand?! LOL =P