Greyboy Jam: Robert Walter and Karl Denson

Robert Walter and Karl Denson have been playing together in the Greyboy Allstars since the 1990s. From jazz clubs to jamband afterparties to their careers as sidemen for Roger Waters and The Rolling Stones, they've seen it all. Here, they speak with Jonathan about the early days of the GBAs, learning to play in front of hippie crowds, and how the music brings them back together over and over.