On the guitar, my earliest influences were San Franciscan Johnny Colla, the Swede Kee Marcelo, the Canadian Alex Lifeson and the dutch Edward Van Halen primarily due to their compositional abilities, rhythm guitar playing and melodic solos. Then I got more into Akira Takasaki, the late James Honeyman-Scott's work, some of what Bob Rock managed to get James Hetfield to do on the black album, some of what Reb Beach used to do, Chris DeGarmo, especially in regards to his tone. Joey Allen's solos, and to a small degree Stevie Ray Vaugn--just had that sick Stratocaster sound... Guys that really made me want to push the limits of what it is I can do were Paul Gilbert, and, to a limited degree, Yngwie J. Malmsteen.
On keyboard, Elton John (his work for Disney in '94 is what got me back into playing again after a two year break from music), Vince DiCola, Ron Wasserman, and David Benoit.
Vocally, I don't have anyone I try to sing like except, maybe, Peter Cetera. It's all I can do to stay on key, not crack and be articulate in the mix. But I've been compared to Howard Jones and Julian Lennon. I would love to be able to sing like Steve Perry or Joe Lynn Turner, though.