If R&B; is filled with lyrics navigating the complex terrain of relationships and emotions, let Mayer Hawthorne simplify things for you: he is comfortable making love in a car. Hawthorne's not as liberated from genre as his marketing would have you believe, but he's clearly not intimidated by the limits of genre, whatever those might be. His show last week in Minneapolis was charming, fresh, and original; he's turning his world of potential into a really entertaining career.