With a wounded whisper that sits in front of a band that falls somewhere between country and classical, Great Lake Swimmers provide thick, interesting arrangements matched with a distinct voice, giving them both flexibility and consistency. Basically, you know what you’re getting yourself into, but they have the ability to twist and turn slow, melancholy sounds in a way that won’t bore you. The Toronto-based group, who have been active since 2003, is touring on the heels of an excellent new album, “A Forest of Arms,” so this is probably a good time and place to see them.