Collecting "Antique" music, I frequently encounter "metrical notation", especially in the old Hymnals; "6s & 8s", "7s & 4s" etc.. A Minister Freind patiently explained all this to me years ago, but being a certifiable music-theory moron, it didn't quite "take", iffya know what I mean... I expect that this has been all written up somewhere, by now on the internet likely as not. Can anyone out there direct me to such a source so I can have another run at it - and hopefully learn something this time?