Yamaha YCL221II student Bb bass clarinet outfitIntroducing the Yamaha YCL221II student Bb bass clarinet outfit The first thing to mention about this stunning YCL221II bass clarinet is the fact that it has the same basic body specifications and tonehole designs as Yamaha's pro model bass clarinets. Consequently the instrument is capable of producing a surprisingly full, rich sound which bears remarkable similarity to that made by much more expensive, wooden models. The instrument features 19 keys,