\relative c'' { 
\cadenzaOn %  a4 b \grace { a16[^( b] } c2 \bar "" \grace { d16[ c16 b16]) s } | \bar "|"  

 \grace b8^(  d2 \grace { c16[ b]) } s \grace a16( b8) g4.(^\markup { \small \rotate #270  \scale #'(2 . 1) "(" }  \grace { a16[ b]) } r4 |

 }