Move book and learner tune link to centre of bottom row, and add popup text. The parts display is not uncomplicated by the images, and they have explanations - at least some users I've spoken to did not understand what they do.

This book is for tunes that are not part of the regular
Havoc session or dance repertoire.

Typically these tunes have either fallen out of popularity at sessions,
or are simply tunes that I like.