…repeat volta 2 { s1} \alternative {{s1} {s1} }} musicA = \relative { c1 d e f g} musicB = \relative { \clef bass c,1 d e f g} …
…repeat volta 2 { s1} \alternative {{s1} {s1} }} musicA = \relative c' { c1 d e f g} musicB = \relative c' { \clef bass c,1 d e f …