being nearly 50 I am probably too old to learn new tricks

Oi! I'm 48 & have been going to clubs regularly for 6 and a bit years. My head was turned by traditional music about eighteen months ago, and since then I've been building a trad repertoire - and building, and building. (I try to get a new song into shape every week.) As for new tricks, I'm just now starting to think about accompaniment (a long story which I've gone into elsewhere).

What should go in the repertoire? Whatever impassions you; whatever moves you to tears the first time you sing it through; whatever makes you think, when you hear it on record, I want to do that.