Thanks. Most software packages seem to include just convert/edit/print/play facilities (although I must admit I haven't tried many)

My own interest is in functions which transform or 'add value' to the tune.

Examples currently available are adding chords, adding 3rds/5ths/etc, converting a melody to a round, and converting a reel to a hornpipe.

Also, for fun, reversing a tune, and generating 'random' tunes in folk styles.

I have not found other software with similar facilities, but a common interchange format would be useful. So far, I have been using abc and also an old text notation from the ACCU music system (Old DOS program), but both are far from perfect for the job. MIDI also has its uses but lacks any notation facility.