-A = \relative c' { c4 d e f | \cueDuring #"qB" #1 { R1 } | }
-B = \relative c' { \cueDuring #"qA" #1 { R1 } | f4 e d c | }
+A = \relative { c'4 d e f | \cueDuring #"qB" #1 { R1 } | }
+B = \new Voice \relative c' { \cueDuring #"qA" #1 { R1 } | f4 e d c | }