If I see in piano sheet music, say, "mp" mark between bass and treble staves, which staff should be played in "mp" dynamics?
Reverse question: if I want to apply a dynamic mark to a specified staff, how to notate this?
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Just to add some working example to the thread, here goes Prokofiev op. 97, no. 10. An adagio from the Cinderella suite for piano. The complete score for this adagio is available here, page 29.
In the first two bars, there are specifications for both staves (forte), and for the upper (piano) and lower (mezzoforte) staves only.