▁of ▁the ▁jam ▁band , ▁the ▁Z en ▁Tr ick sters , ▁and ▁guitar ist ▁in ▁the ▁Don na ▁Jean ▁God ch aux ▁Band ▁with ▁Jeff ▁Matt son , ▁which ▁features ▁the ▁Gr ateful ▁Dead ’ s ▁Don na ▁Jean ▁God ch aux . ▁Matt son ▁was ▁named ▁the ▁permanent ▁lead ▁guitar ist ▁for ▁Dark ▁Star ▁Orchestra ▁in ▁November ▁of ▁ 2 0 0 9 . ▁A ▁veter an ▁of ▁ 3 0 ▁years ▁on ▁the ▁road , ▁Matt son ▁is ▁a ▁guitar ▁player ▁whose ▁style ▁ranges ▁from ▁rock ▁& ▁roll ▁to ▁bl ues , ▁bl u egr ass , ▁country , ▁jazz , ▁folk ▁and ▁psych ed elia . ▁Jeff ▁is ▁also ▁a ▁strong ▁original ▁song writer ▁and ▁his ▁work ▁is ▁prom in ently ▁featured ▁on ▁five ▁albums , ▁including ▁several ▁pieces ▁co - written ▁with ▁band mate ▁Don na ▁Jean . ▁He ▁is ▁a ▁co - writer ▁of ▁“ Le ave ▁Me ▁Out ▁of ▁This ,” ▁a ▁track ▁on ▁Phil ▁Les h ▁and ▁Fri ends ▁Sony ▁CD , ▁" There ▁and ▁Back ▁Again ." ▁Jeff ▁was ▁asked ▁to ▁aud ition ▁for ▁Phil ▁Les h ▁& ▁Fri ends ▁in ▁the ▁fall ▁of ▁ 1 9 9 9 ▁and ▁in ▁October ▁ 1 9 9 9 . ▁Jeff ▁and ▁then ▁Z en ▁Tr ick ster ▁keyboard ▁player , ▁Rob ▁Bar rac o , ▁played ▁three ▁shows ▁with ▁Phil ▁Les h ▁and ▁Fri ends ▁at ▁the ▁War field ▁Theater ▁in ▁San ▁Francisco . ▁ 1 9 9 9 . ▁ ▁Disc ography ▁ ▁with