The alternative dictionary to Barlow and Morgenstern is by Denys Parsons
and called "The Directory of Tunes and musical Themes" (published in
1975).  You can find both methods explained at the following address:

   http://www.af.lu.se/~fogwall/notation.html

and have a try of the Parsons method at:

   http://name-this-tune.com/pc.html

Heinz Kern