Draft for review. This specification isn't authoritative until the Clone Hero and YARG developers have approved it, and scan-chart 9.0.0 isn't released yet.
function authoredSongEvents(chart): AuthoredSongEvents;
The tempo map, time signatures and song text events of a chart file, as written, from the section or track Clone
Hero reads for each. Empty for a .mid file that can’t be read.