Resist concussed ideophones And Sach's mental snot Castanets are percussion And clarinets are not
Castanets are H-S 111.141 (Directly struck concussive idiophone, 111.1 being concussion idiophones as opposed to 111.2 percussion idiophones)
The clarinet is 422.211.2-71 (Single-reeded aerophone with keys, where 422.2 was originally percussive reeds)
I think a T shirt with "Hornbostel Sux" on the back and that rhyme on the front (or vice versa) might sell, particularly to drummers. e.g. I want one. And also one that says Save the planet Pluto.