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A music teacher.
A Musician. or a percussionist if they like, play percussion instruments
forceps
If its a stringed instrument like a violin or guitar, they're called a luthier. Don't think there is any special word for trumpet maker or clarinet maker. Trumpet artisan might work.
Instruments that are blown into are either woodwind instruments, double reed instruments, or brass instruments, with the single exception of a harmonica, which is in a class all its own.
drums
A quintet.
A cappella
A Cappella
A recorder
Id call them a musical group or 'band'.
Apart from the String instruments there are also the brass, woodwind and percussion families.