What rock musician usually wears a top hat?

Alice Cooper (born Vince Furnier)

I think Slash wears one pretty frequently too

https://en.wikipedia.org/wiki/Slash_%28musician%29

In the 60's Jerry Garcia wore one on an album cover.

https://en.wikipedia.org/wiki/The_Grateful_Dead_%28album%29

Saul Hudson, AKA Slash, is frequently seen wearing a top hat. The following links are pictures of Slash attired in this style of hat.

http://www.imdb.com/gallery/granitz/6597/Slasharri_Steve_15017445_400.jpg.html

http://www.imdb.com/gallery/granitz/5880/Events/5880/KeithRicha_Mazur_13134623_400.jpg?path=pgallery&path_key=Slash

http://www.imdb.com/gallery/granitz/4826/Events/4826/Slash_Mazur_8785292_400.jpg?path=pgallery&path_key=Slash

http://www.imdb.com/gallery/granitz/4826/Events/4826/Slash_Mazur_8785752_400.jpg?path=pgallery&path_key=Slash

Leon Russell often wore a top hat. Sometimes a cowboy hat, sometimes something else, but people seem to remember the top hat most often.

http://www.leonrussellrecords.com/memory_lane.shtml

Look up the words "gracious", "professional," "incandescent," and "muscle" in Webster's Dictionary. By each, you'll find a picture of a guy with long hair, a top hat, and a quixotic smile. Those of you who've been similarly touched will know what I mean. The rest will just have to take it on faith that, one night in an empty room in a loud town, Leon wrote The Book.
http://www.leonrussellrecords.com/forum/index.php?entry=2540

Barry Manilow often wears one.

Anthony Kiedis of Red Hot Chili Peppers has worn one on many occasions.

Billy Corgan of The Smashing Pumpkins/Zwan as well.

Jimmy Page wore a top hat-like adornment at times.

But I imagine it is Slash of Guns n Roses that you seek.

Now come on - the question said rock musician - what's Barry Manilow got to do with rock?

We're goin' hoppin'
We're goin' happin' today
Where things are poppin'
The philadelphia way
We're gonna drop in
On all the music they play
On the bandstand

Sorry to admit that I DO know the lyrics (in part) to this song. It IS Rock and Roll at the core.

Other than that he is a Square Peg in my world.