![](http://www.alamy.com/thumbs/6/D7210623-3A7C-41DE-9166-CBD898A8FF13/P4YWF4.jpg)
Thumb on the overblow or speaker, or octave key on a B flat clarinet
Size: 3443px × 5164px
Photo credit: © © chrisstockphoto / Alamy / Afripics
License: Licensed
Model Released: No
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