We haven’t seen a young, talented Scot make waves this size since Sheena Easton was taking the morning train all those years ago, and that was back when KT Tunstall was still in tartan nappies. We should probably mention Texas too—the Glaswegian band that scored with the simmering “I Don’t Want a Lover” in 1989, not the enormous state where American presidents go to get gooned at the ranch or shot in the head. The difference between Texas the band and KT Tunstall, of course, is that Tunstall has persisted in impressing us on this continent, even after “Black Horse and the Cherry Tree” screamed one-hit wonder. Tunstall’s newest album, Drastic Fantastic, further proves there’s lots more to come, although hopefully she’ll trot out her charming version of the Undertones’ “Teenage Kicks” when she arrives at the Commodore on Sunday (May 11).