Anything that has entered my ears has influenced me, as long as it had soul!
But specifically, as far as songwriting goes, my major influences are:

Elton John/Bernie Taupin
The Beatles
Rodney Crowell
'80s Pop/Rock
'90s to current country (Jeffrey Steele, Craig Wiseman, Tony Arata)

As far as guitar playing...

The English...Jeff Beck, Eric Clapton, Jimmy Page, Pete Townsend
The Texans...Billy Gibbons, Eric Johnson, Charlie Sexton, Doyle Bramhall II, Gary Myrick, Stevie Ray