Many of the sites which have visible music notation use either gif or pdf to store the notation. Yes - they are MUCH larger in file size then ABC or even the midi's used here for the Digital Tradition. (the "native" file format for the music in the Digital Tradition is Songwright - a system similar to ABC)

For those tunes which are in the DT (Oct '99 version)we can point to YET ANOTHER DIGITAL TRADITION which does display the tunes as notation and also in other formats.