I had to find some instances of weapons with a musical motif and it was more work than I'd planned. Initially, I had to search the "weapon" and "instrument" tags together, then start filtering out series which commonly have these two items together separately. I maxed out my search and still had far too many pages to go through easily.
So I propose a tag for when a weapon is still a standard weapon (like a sword, staff or axe) yet it clearly has the likeness of a musical instrument. This tag is -not- for when a musical instrument is being used as a weapon, like smashing somebody with a standard guitar.
It's more common than you'd think.
and I'm sure I missed many, many more.
I'm having trouble naming the tag. instrument_themed_weapon maybe? I'd appreciate input on this before I start adding it.
Updated by Apollyon