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From: SEG92@GENESEO.BITNET (the Talking Drum)
Newsgroups: bit.listserv.allmusic
Subject: RE: Open & Closed rolls?
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Date: 5 Feb 90 19:58:00 GMT
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An open roll is a roll that is not closed.
--Talking Drum

No, but really, I think it has a lot to do with the "tightness" or "looseness"
of the roll . . . that is, how precise it is.  I think.  But don't quote me.
It's been years since I had formal training.
--me