^Cymbals are a rather special case. The tuned cup chime and untuned bell cymbal are identical except in name and usage. But here we regard them as different instruments, the cup chime tuned and the bell cymbal like all cymbals untuned. They could quite as logically go into the group sometimes used in either role, but that would have the consequence of bringing the larger group of all cymbals into that group too, which is misleading.
^ abhttp://www.soundjunction.org/profiletunedpercussion.aspa?NodeID=2 retrieved 13 March 2012 There are lots of tuned percussion instruments. Among the most common are the xylophone, marimba, the glockenspiel, the cowbells and the temple blocks. Other suthorities cited here however say that temple blocks are not considered pitched nstruments.
^http://www.music.vt.edu/musicdictionary/textt/Templeblocks.html retrieved 13 March 2012: Although temple blocks are not considered pitched nstruments, they can produce discernible pitches, and some temple blocks are actually tuned to the pentatonic scale. Other authorities cited here however say that temple blocks are tuned percussion.