How about, a single thread titled (e.g) "assistance with instruments" or "guidance for players". A single message at the start of the thread could direct readers to one of the threads in each group of instruments. i.e. one guitar thread, one tin whistle thread, one washboard thread, etc.,
This would, effectively, become an index to available thread groups as many Guitar threads could be found from that one initial link.

Perhaps a 'permathread' for grouped discussions might be an even better solution.

However, I'm happy as things are, and also sometimes pass possible linked threads to Joe for consideration.

CHEERS

Nigel (hard at work!)