| Yes there are, at least 98 of them, although they may be called by various names. It is technically,as I understand it, a term you can use correctly to describe any 7 tone octave scale with any two notes deleted. I have misplaced my favorite "Pocket Music Theory" book, which is a wonderful cheap and concise and useful paperback. There is also a bit of good stuff in the classic "Bass Grimoire" By Adam Kadmon, Carl Fisher publicaions.
Actually, the wikipedia entry is pretty informative also: wikipedia.org/wiki/pentatonic.scale or just google "pentatonic" .
Thanks for asking, I enjoyed the review, and likely needed it more than you. Cheers
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Mediocre bassist club, number 84.
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