Shogie - JC's Tune finder click herehas thousands of fiddle tunes that can be downloaded as midi, ABC format or standard notation (several formats available - postscript, pdf and gif, I think)
For that site, you do have to know a tune name.
there is a mirror site for the Digital Tradition that will give you notation if the DT contains a tune for the song.
That is at Yet Another Digital Tradition
The digital tradition can be searche with keywords - so if you have some idea of a subject you would like to sing about - then you can search on that.
Have you read the FAQ at the top of the Forum page yet? There is tons of information in there.
And welcome to the MudCat Cafe!