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I checked the 2nd ed. of Grove and it says they're very much the same in a musical context, with iqa' being a more standard usage. Of course each term has its own etymology. In Arabic music, often terms used in poetry have a slightly different meaning when extrapolated to music. Badagnani (talk) 04:18, 1 April 2008 (UTC)
I'm convinced. Merge. Hyacinth (talk) 04:32, 1 April 2008 (UTC)