"Techniques" wouldn't be a song tag really.

Maybe a "practical" tag, to cover threads about musical techniques and musical gear - and maybe also those seeking or offering advice on where to find clubs and so forth?

And just one tag, to cover treads starting as requests for either tunes, words or chords; and another to cover those starting as unsolicited additions of either tunes or words.

Plus History (incorporating folklore), Obits, and "Issues". Six in place of nine.