[Koha] Music notation or printed music - how to make it obvious

[Elaine Bradtke]

For some reason, in all the years that our little library has been in
existence, no one has bothered to specify when a publication is
primarily music notation.  I'm changing this as we migrate to Koha
(nearly half our stuff is music notation), but before I take the
plunge I need to think about how it will work, and what it will look
like.

It's my understanding that Koha stores Leader information, but does
nothing with it, is this correct?

I want something that will show up clearly, is easily spotted. Not
buried somewhere in the physical description or down in a notes field.
 I'm disinclined to use general material designations, but that could
be one way.  The other thought was item type. Collections seem less
intuitive somehow, and as we have lots of special collections which
might contain individual publications of music notation, I'm not sure
if that works.
Anyone with experience in this?
Thanks

-- 
Elaine Bradtke
EFDSS