Lau was recommended to me a few weeks ago in connection with an Irish artist. I like their music because it's very jolly as gaelic music often is.
Lau is a Scottish contemporary folk band, who are named after an Orcadian word meaning, "natural light". Kris Drever plays the guitar and sometimes sings and he has also released some solo music. Martin Green plays the accordion and the piano and Aidan O'Roarke plays the fiddle.
If you'd like to listen to more samples of their music, here's the link to their album on Amazon: Lightweights & Gentlemen.