Improvisational synonyms

Part of bluegrass' charm lies in the instrumental solos which are improvisational and notoriously difficult to play.

The best -- well, most charming -- scenes appear improvisational afterthoughts.

From quirky improvisational actor, to aspiring rock musician, to big time screen star, Jack Black has paid his dues.

His first role was in the 1991 film Curly Sue, but he continued to teach improvisational comedy at Second City and perform with their comedy troupe from 1990-1996.

During his two years with the show, he performed with the improvisational group, The Groundlings, and acted in infomercials.