I found myself listening to Mumford and Sons' Babel, and my friend and I couldn't quite agree on how to describe the rhythm. I won that battle since my way led to groups of four figures, whereas his led to groups of six. So, this rhythm:
(Ignore the inconsistent line-widths (still), it is not an indication of stress. I'll try again with png and hard-coded res.)
That thing at the end, is that a hemiola or what?
Were the metrical impulse to be not a three-beat pattern changing to a two beat one (as in the Mozart example above), but one where a two-beat impulse changes to a three-beat one, the pattern of 2:3 would be known as subsesquialtera.
But the terms appear to apply only to whole measures, not partial measures, so would it be a demi-subsesquialtera?