I have a liking for old pen nibs and quill pens. I collect them whenever I see them. There are a surprising number of different nibs available, designed to produce different calligraphic effects.
However my favourite nib is this rather splendid one that a very good friend of mine gave me. It is a nib that draws musical staves.
I sometimes imagine it being used by some classical composer long ago, to write symphonies or string quartets. :)
@kali66 To be honest I don't tend to write my own music down. It just stays in my head. But I do jot down odd melodies that come to me, as a reminder for future song writing sessions.