I created a bare-bones content filter to add musical notation to Drupal content, using the VexFlow / VexTab music engraving library. Here's a little sample, also showing my fork of the original library to handle basic Arabic musical notation (quarter tones and special scales):

tabstave notation=true tablature=false clef=treble key=Rast
notes C/4 D/4 E%@/4 F/4 | G/4 A/4 B%@/4 C/5

Feel free to fiddle with the music snippet above.

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