Williams then appeared with the Rhythm Devils in nine July shows on their summer tour .
Williams played as a member of the Rhythm Devils with Grateful Dead drummers Bill Kreutzmann and Mickey Hart at the Gathering of the Vibes festival in 2010 .
Williams then appeared with the Rhythm Devils in nine July shows on Rhythm Devils ' summer tour .
Williams played as a member of the Rhythm Devils with Grateful Dead drummers Bill Kreutzmann and Mickey Hart at the Gathering of the Vibes festival in 2010 .