I could never pick just one. I don't have "one" favorite song because it depends on how I feel at the time. I can list a few favorites though:
Summertime/Take another piece of my heart - Janis Joplin
Magic Carpet Ride - Steppenwolfe
Patience - GNR
For What It's Worth - Buffalo Springfield
Space Cowboy - Tom Petty
Jamie's Cryin/Hot for Teacher/Ice cream man/Beautiful Girl - Van Halen
Take the Money and Run - Steve Miller Band
Night Moves/Hollywood nights - bob seger
Black magic woman - Santana
White Wedding - Billy Idol
Moondance - Van Morrison
Born to Run - Springsteen
Anything Aerosmith, Skynyrd, Eartha Kitt, Led. Zep, GNR, Dylan, classical, jazz, swing or big band. Thats just the tip of it. The only music I don't like is "gangsta" rap and some country.
I've been involved in music all my life; I love it. Playing it or listening to it.
EDIT: Yamanjazz - I love the Ella Fitzgerald/Duke Ellington version of Birdland! When I was in jazz band, we played a version of it at nationals; it was an absolute blast to play!