Zach could appreciate good music, and he had heard a rather lot of it over the years. So unless this one were something muggle - and Ernie's background did not suggest that really - it was either exceedingly rare or...self-composed. For a moment, Zach stopped worrying about plans and ideas and what would come next.
His eyes watched Ernie, watched how he moved and how the music moved him. And he felt a bit compelled to...no he couldn't. Zach shut his journal, which automatically left it very well hexed against anyone who picked it up from reading it, leaned back and listened. Ernie was beautiful.