Sunday's music at the Pitchfork Music Festival began with dessert. Between the dull, thudding chords of Cass McCombs and the first laconic and then tortured feedback of the Girls, a fresh, sunny new pop band called Best Coast held down the Balance stage -- the "small" stage, under the trees -- with a workmanlike attitude and a handful of cheery love ditties. Ultimately unpretentious, Best Coast (Bethany Cosentino and two pals) ran through songs from the debut "Crazy for You" CD, filled with bright major chords and lyrics like "I'll try to make you mine" and "that's just not your deal." The crowd got a big chuckle when she sang, "I lost my job / I miss my mom / I wish my cat could talk." She closed with the trendy single "When I'm With You," the repeated refrain of which is, "When I'm with you, I have fun." So true.