There are loads of songwriters who ward off monotony with stylistic shifts. But even if local fixture Korby Lenker couldn’t flit from folk tunes that’d please an exacting folk festival crowd to soundtrack-ready indie pop — which he can, and does — he’d still have a fascinating array of personas and ranges of expression in his bag of singer-songwriter tricks. I submit his self-titled, self-released new album as proof. During one track, he’s the model of sweetly voiced chivalry (“If I Prove False”); two tracks later he’s singing — in slinky falsetto over rubbery funk bass — about eye candy getting him all hot and bothered (“Forbidden Fruit”), and it’s not too long before he’s offering up empathetic real talk about relationship ruts in the electro-pop tune “Here We Go Again.” Clearly there are many sides to Lenker, from earnest to searchingly philosophical, pop-savvy, digital-age resourceful (check out his online music videos and Web performance series Wigby) and even literary (he’s also releasing a new short story collection). Doesn’t leave much room for boredom.