Happy 4/20 everyone! To help you get in the groove of today's counterculture celebration, we've created a special playlist, and we want your contributions!

Follow 7x7SF on Rdio and add your suggestions to the 420 Playlist. For those out of the loop, 4/20 is a common term used to refer to marijuana consumption. Allegedly, the popular codeword began in the early '70's in our own backyard of San Rafael. 

Today, observance of 4/20 at 4:20 p.m. will occur around the world, from Auckland to Ottawa to probably the most long-standing revelry on Hippie Hill in Golden Gate Park. Be on the lookout for the huge puffy blue cloud above San Francisco later this afternoon.

And now a little something to get you in the mood...