If you follow Ryan Leslie on youtube you have seen him create songs from scratch in the studio before for artists like Cassie. Leslie takes a slightly different approach in his latest video. He creates a new song "5 Minute Freshen Up" from scratch, playing all of the instruments himself including the piano, organ, bass guitar, tambourine and drums.
After the song is complete he invites a Twitter follower to the studio to come check it out. She then invites several of her friends and it turns into an impromptu party.