Here's my two cents with the full transcription on the final page. The song progress bar is very unintuitive. The first half of the song is an utter mess of Verse-1s and Intro-1s. While it would be nice to be able to sum up two whole minutes of a song with 2 sequences, this provides none of the intuition that in my experience is easiest for beginners to pick up on: the cues you get from listening to the instruments and vocal melodies. I get that this document could be annotated, but an ideal notation system should be both simple to learn and explicit enough to not require the user mark up the document while listening.