\set Staff.instrument = \markup { \column < "Clarinetti" { "in B" \textFlat } > }
\set Staff.instr = \markup { \smaller { "Cl(B" \textFlat ")" } }
\set Staff.instrument = \markup { \column < "Clarinetti" { "in B" \textFlat } > }
\set Staff.instr = \markup { \smaller { "Cl(B" \textFlat ")" } }