David Gilmour is celebrating his birthday today, March 6,with a gift for you.

And while his cake will be illuminated with 66 candles, they still won't beam as brightly as his storied career with Pink Floyd. So many songs to choose from -- but which is your favorite?

Gilmour joined Floyd in early 1968, eventually taking over lead guitar duties, and his battles with frontman Roger Waters were sometimes as epic as the songs Gilmour wrote or co-wrote. He's also released four solo albums, donated millions to charity groups, and served as a producer for artists including Paul McCartney, Eric Clapton and Bob Dylan -- but his work with Pink Floyd is clearly his most enduring legacy.

So tell us -- which Pink Floyd song gets your vote?