We got an introduction to San Fran emcee A-1 via the very well crafted, The Neighborhood, piece giving us an inside look at where he grew up and a live performance. Today, get another sample of dude’s work with this video for “Circulate” produced by WooStaar & ATG. Video directed by WooStaar. Yes, we know who else used this sample, but listen to dude spit, can always appreciate some honest hip-hop. A-1′s The Book of Adam, mixtape is out now.