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Konrad Stein on the German discussion page makes a pretty clear case that "m" is the modern standard. Unlike New Grove, Brockhaus, MGG, etc. we're amateurs, not pros, and as WP:NOR indicates, we're really not supposed to be going out on scholarly limbs. I realize that this is a very minor limb to go out on, but it makes some sense to be fully consistent in respecting the NOR principle.
On the other hand this is certainly not a big deal and if you want to change it I won't put up a fuss.
Re your last point: yes indeed, the lead paragraph should certainly match the title, whichever you decide. Regards, Opus33 (talk) 03:39, 15 July 2010 (UTC)