Function transcribe_heading 

pub fn transcribe_heading(
    sharps: Option<Option<IntegerType>>,
    meter: Option<&TimeSignature>,
    tempo: Option<&TempoText>,
    metronome: Option<&MetronomeMark>,
    max_line_length: usize,
) -> Result<String>

A heading: the tempo words above, then the metronome mark, key and time signature, each line centred: music21’s transcribeHeading.

Errors

Nothing to head with.