Almost any tune is a good one when you are in love. If it's Appalachian fiddle you play, try some of the old modal tunes (like the ones Betty Vornbrock plays on her Wolves in the Wood CD) which are "spare and sparse". If you are paper-trained, try some of the good ones out of Fiddlers Fakebook. And for sweetness try some of Carolan's best (Sheebeg and Sheemore, Fanny Power, Morgan Megan) Etc. Have fun