There was a time, when I badly wanted a fishing pole with musicianship (for my crafter) but I wasnt able to create one. I guess I gave up after about 200 on a tc with a heartwood runic. Even if 200 isnt any reliabale number, I would assume, that music doenst show up on fishing poles.
Besides that, you cant have a singing axe, a dryads bow and a fishing pole equipped at the same time. *g*
Depending on the reason, why youre looking for musicianskills on item, you could spend some real skillpoints for music and replace instead other skills partially by items. (For example you could look for a spellbook with two times 10+ skill in magery and meditation instead of searching for a one-handed item with musicianship.)
And not to forget about the soon-to-come imbuing. It could be possible to imbue mage weapon/sc onto a singing axe and therefor increasing the usefullness of that axe.