▁ 2 0 1 5 ▁alongside ▁the ▁original ▁four ▁surv iving ▁members ▁and ▁Tre y ▁An ast as io ▁of ▁Ph ish . ▁ ▁Coll abor ations ▁with ▁Justin ▁Vern on ▁ ▁In ▁ 2 0 1 6 ▁[ Day ▁of ▁the ▁Dead ], ▁a ▁Gr ateful ▁Dead ▁cover ▁album ▁benef itting ▁the ▁[ Red ▁Hot ▁Organ ization ], ▁an ▁international ▁char ity ▁dedicated ▁to ▁raising ▁funds ▁and ▁aw aren ess ▁for ▁H IV ▁and ▁A ID S , ▁was ▁released . ▁Horn s by ▁performed ▁on ▁one ▁track , ▁" Black ▁M ud dy ▁River ", ▁along ▁with ▁ind ie ▁folk ▁band ▁( and ▁Vern on ' s ▁former ▁band ) ▁[ De Y arm ond ▁Ed ison ]. ▁Horn s by ▁performed ▁the ▁song ▁alongside ▁Vern on ▁that ▁same ▁year ▁in ▁E au ▁Cla ire , ▁W I . ▁Horn s by ▁performed ▁alongside ▁Vern on ▁at ▁Co ach ella ▁in ▁ 2 0 1 7 , ▁performing ▁" I ▁Can ' t ▁Make ▁You ▁Love ▁Me ;" ▁the ▁performance ▁also ▁featured ▁Jen ny ▁Lewis . ▁ ▁Work ▁with ▁S pi ke ▁Lee ▁Horn s by ▁has ▁composed ▁and ▁performed ▁for ▁many ▁projects ▁with ▁long - time ▁collabor ator , ▁film maker ▁S pi ke ▁Lee ▁including ▁end - title ▁songs ▁for ▁two ▁films , ▁C lock ers ▁( 1 9 9 5 ) ▁with ▁Ch aka ▁Khan ▁and ▁B am bo oz led ▁( 2 0 0 1 ). ▁He ▁contributed ▁music ▁for ▁If ▁God ▁Is ▁Will ing ▁and ▁da