Possible Clues:

• Like a quarter's edge
• Like a clarinet
• Thatched
• Like clarinets
• Regarding Harcourt and Sheeran, say, as clarinet and saxophone?
• Like clarinets and oboes
• Like a usable clarinet
• Read it out to the audience what happened to windy mouthpiece
• Made grooves on, as the edge of a coin