It hardly needs repeated kvetching, but Minnesota winters are harsh. Fortunately the voice belonging to local singer-songwriter Robert Skoro is as lightweight and airy as a pashmina shawl. It wraps itself around your neck and keeps you warmer than a hot water bottle. In Skoro's words--comforting and wise beyond the author's mere 24 years--you've got a new best friend. So perhaps you'll want to think of his debut solo work, Proof (Merciful), as the baby blanket of local releases. Since parting with Mason Jennings's band late last year, Skoro can more often be found around town, cozying up to the nightclub stage and warming an audience instead.