Sweet, soothing, bucolic indie-folk. Can we ever get enough of it? Well, yes, we can, but Cannons and Clouds are unlikely to be the outfit that sends you (or us) over the edge. The San Francisco six-piece deals in an especially lovely blend of acoustic guitars, classical harp, and lush harmonies. More importantly, they also manage to write good songs: Note the lulling warmth of "Will a Rainstorm Save Us All From the Wrath of God" and the energetic, wistful love tune "Where Reality Has Me." The group headlines Amnesia this week for the second installment of local label 20 Sided Records' monthlong residency, which continues every Tuesday in January at this favorite Mission club.