Notes on supplied grammar and supporting code
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The generation of randam melodies works as follows:

* Apart from the grammar, there is an input abc file.
  The random melody will make use of the header information
  from the abc file when making sense of the list of ptiches and
  durations give as the raw ouput from the random generation.

* In particular, the key signature and time signature (if given) are
  taken from the input abc file and reused in the ouput;
  there is a restriction that accidentals are not dealt with in the
  process (so each pitch f is either f sharp or f natural according
  to the given key signature).

* Other features can be enabled by editing the  .abc input file
  (eg tempo -- but translation of tempo by conversion to lilypond
   has some problems)

* The actual notes of the input abc file are ignored
  where genetaring a random melody.  You can choose some other
  single-line (monophonic) abc file, or write your own.

* There are some other tools around, like abc2midi that does direct
  translation, and does respect the tempo setting.  midi players
  let you configure the speed and instrumentation.