I have just added musical sigils as a method to the Sigil Generator! Time, cleff, key, rests you can improvise to whatever makes it sound nicer musically. Pitch can be adjusted slightly for the instrument/musician.
Have fun with it! This is my first attempt at a tool for sigilizing music, and I may release something more complicated or specific in the future, possibly specifying sharps and flats using a more chromatic method.