Singer Joan Osborne and ace guitarist Jackie Greene of Trigger Hippy met us at Phil Lesh's Terrapin Crossroads in San Rafael, California, for this edition of 'Acoustic Guitar Sessions,' in which they perform gritty and soulful versions of “Rise Up Singing” and "Pretty Mess," from the supergroup's self-titled debut album. Trigger Hippy's original and current members hail from bands ranging from the Black Crowes and Widespread Panic to the granddaddies of jam, the Dead. For more 'Acoustic Guitar Sessions,' go to: http://www.acousticguitar.com/Sessions