I had a small struggle to find the étouffez symbol for harp (𝄌) in the playing techniques sidebar, and found it in the unpitched percussion section. Other varieties of étouffez, with arrows and such, are under pitched percussion. For percussion, this may make sense, but for harp, this is confusing. A few harp-specific techniques like p.d.l.t. are also under pitched percussion. May I suggest to include a separate harp section in the list of playing techniques? After all, guitars have their own too.