The Rex Foundation will be the beneficiary of a new digital-only release aptly titled REX (Live at the Fillmore). The collection draws together the Grateful Dead compositions performed live by Keller Williams, Keith Moseley and Jeff Austin at Denver’s Fillmore Auditorium on February 8, 2006. The three were billed as Grateful Grass that evening, delivering versions of such songs as ‘Bird Song,’ ‘Eyes Of The World,’ ‘St. Stephen’ and a move from ‘Scarlet Begonias’ into ‘Fire On The Mountain’ all of which appear on the release. Following an appearance at the Jammys, Williams will spend much of his summer on the road with Austin as he will tour with the Yonder Mountain String Band.