#### Metronome_mark_engraver

Engrave metro nome marking. This delegates the formatting work to the function in the metronomeMarkFormatter property. The mark is put over all staves. The staves are taken from the `stavesFound` property, which is maintained by `Staff_collecting_engraver`.

Music types accepted:

metronome-change-event

Properties (read)

`metronomeMarkFormatter` (procedure)
  How to produce a metronome markup. Called with 2 arguments, event and context.
`stavesFound` (list of grobs)
  list of all staff-symbols found.

This engraver creates the following layout objects: MetronomeMark.

`Metronome_mark_engraver` is part of contexts: Score

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