Impressionist? Sorry for using the wrong word ... Frank Caliendo is good.
I'm a big Beatles fan. I found the Engish comedian and impressionist
Stevie Riks amazing.
He does a "teach yourself" series: John Lennon, Paul McCartney and George Harrison great. As well as a skit doing both Mick Jagger and Keith Richard. Mick is trying to get into the bathroom while Keith is teaching a guitar lesson. Hilarious stuff.
Stevie is a gifted musician.
Besides the Beatles and Stones, he does alot of other singers and musicians as well.
Yes, he's on youtube.com. Check him out there.