For settings of traditional tunes, you can find a lot at www.thesession.org They have screenshots of the tune as well as having it written out in ABC format (and there are a lot of shareware/freeware ABC readers out there, I use Melody Assistant). There are also a ton in ABC format here as well: http://www.ibiblio.org/fiddlers/index.html

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It is the melody which is the charm of music, and it is that which is most difficult to produce. The invention of a fine melody is a work of genius. - Joseph Haydn

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