Hello Kieren, That’s because at this point the Dynamics context does not exist anymore, so you cannot switch to it.
The culprit is the line 57
\new Dynamics \new Container = "piano_dynamics" s1
So Dynamics only has one bar, after that the context ends. I advice you to do
{ #(skip-of-length piano_upper) } instead of s1, because thus the context will
automatically have the same length as your right hand staff context.
Cheers,
Valentin
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