hello there. I've made a wikipage chiefly to store related research about how to figure out some complicated instrument relations:
the things in interested in right now is whistles/flutes/recorders/pipes/etcetra and how they are different
and secondary: how tambourines/drums/snaredrums/etch relate to eachother and how they are different.
if you want to help me with (mostly the latter) you can add links to http://wiki.musicbrainz.org/User:CatCat/links_for_instrument_research
there is also a related Jira ticket: http://tickets.musicbrainz.org/browse/INST-413