> I think it's not uncommon for two clefs to appear side by side at the > start of a piece (e.g. when a piano piece starts with both staves in > bass clef so as to alert the pianist that the upper staff is not in > treble clef). > How is this done in LilyPond?
See https://lsr.di.unimi.it/LSR/Item?id=792 and https://lsr.di.unimi.it/LSR/Item?id=956
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