Howard Hamilton and Laura Bennett connected over mutual admiration for each others’ visual art, but the two have made a larger splash through their music. The duo, known as the Red Pens, performed last weekend at First Avenue through Radio K’s showcase of the “best bands of 2009.” 3-Minute Egg was in the front row, in the wings, in the balcony, and also in the couple’s basement apartment, where Hamilton and Bennett store much of their visual art.