Robbie's response to Jason Balcom on this topic is good advice.
The best one can probably do is to adapt suggestions for sound
recordings in general.  The current edition of the Chicago Manual
of Style provides a little more guidance and some helpful examples.

"14.263 Musical Recordings.  For the typographic treatment of musical
compositions in running text, see 8.193-97.  Those guidelines, however,
do not necessarily apply to recordings when listed in a note or a
bibliography.  Symphony or sonata, for example, is capitalized when part
of the title of a recording.

"A citation may begin with a title in a note; in a bibliography entry,
list by author, performer, or other primary contributor.  If the
conductor or performer is the focus of the recording or is more
relevant to the discussion than the composer, either one may be listed
first.

"For the date, include the date of the recording or the copyright date
or published date included with the recording, or both.  If a date or
other information cannot be determined from the recording (a common
problem with older recordings and with music files downloaded out of
context), consult a library catalog or other resource; citations
without such information are generally unacceptable.

"If no date can be found, use "n.d." (for no date).  Recordings on LP
or disc typically include acquisition numbers, which follow the name of
the publisher with no intervening comma.  For streaming audio formats
and downloads, list the service or the file format, as applicable."

Some examples, although the formatting gets lost here:

  Mozart, Wolfgang Amadeus.  Don Giovanni.  Orchestra and Chorus of
the Royal Opera House, Covent Garden.  Sir Colin Davis.  With Ingvar
Wixell, Luigi Roni, Martina Arroyo, Stuart Burrows, Kiri Te Kanawa,
et al.  Recorded May 1973.  Philips 422 541-2, 1991, 3 compact discs.

  Pink Floyd.  Atom Heart Mother.  Capitol CDP 7 46381 2, 1990, compact
disc.  Originally released in 1970.

  Rubinstein, Artur, pianist.  The Chopin Collection.  Recorded 1946,
1958-67.  RCA Victor / BMG 60822-2-RG, 1991, 11 compact discs.

  Weingartner, Felix von, conductor.  150 Jahre Wiener Philharmoniker.
Recorded in 1936.  Preiser Records PR90113 (mono), 1992, compact disc.
Includes Beethoven's Symphony no. 3 in E-flat Major and Symphony no. 8
in F Major."

A citation for a piano roll might look like this:

  Chopin, Frederic.  Ballade F-Dur, op. 38.  Eugen d'Albert, pianist.
  Recorded 1927.  Welte-Mignon 2977, 1930, piano roll.

Jerry McBride
Music Library, Stanford University, California
jlmcbrid@stanford.edu.geentroep [delete ".geentroep" to reply]

 [ See also http://www.chicagomanualofstyle.org/home.html  -- Robbie