A MusicXML score read into parts of bars, each bar a list of voices and each voice a list of notes and rests in order.
Lengths are in quarter notes, pitches are as they sound, and order lists the bars by number in the order the score plays them, its repeats and endings taken.
runs is the same order cut wherever the score jumps or crosses a repeat or an ending, so it can be written as ranges.
Summary
Functions
Reads a compressed .mxl or an uncompressed MusicXML file, and returns {:ok, score} or {:error, message}.
The MusicXML text of a compressed or uncompressed score, as {:ok, xml} or {:error, message}.