What song am I thinking of?

So for my orchestra class, my teacher asked us what we should do for a new piece. Since my teacher also happens to be my private lessons teacher, he asked what I preferred.

I personally like Celtic fiddle pieces, and I immediately thought of an Irish song that’s really popular in commercials. But I have no idea what it’s called or where to even look. It sounds like it’s an accordion playing the song in the commercials, but I’m sure it could be transposed into violin music.

Does anyone know what I’m talking about? I can try to find a link, but I’m not even sure where to start.