And, Elton John was TOTALLY trying to be like Little Richie, soooo what makes him any different from Lady Gaga being influenced to play the piano on stage like him??
And besides, if we had to compare Gaga with someone, it'll be Freddie Mercury. They perform the same exact way, but she had mentioned LOTS of times that she's a big Queen fan; in fact her name was inspired by a famous song from Queen. So what is your point?
If you ask me, Elvis has to the one only one to copy the most out of soo many other artists before him, and yet he is still awesome because he somehow mixes it with his own! Same goes for the Beatles who were heavenly influenced by Buddy Holly which made them famous...and the same goes with Rolling Stones, Led Zeppelin by blues artists, and Prince copied Jimi Hendrix, Jimi Hendrix was inspired by Chuck Berry, just as any other guitarist from the 60s.
JSYK, there's really no originality in the music industry, every artist in some way, some how, inspired and influenced with one band and they just then try their best mixing and incorporating their own idea. That's just how it rolls.