Just a couple of young bucks in the Minneapolis music scene, Baby Grant Johnson and Rich Mattson met in the late 1980s while playing rock’n’roll. Johnson, a member of several bands, including Beyond Zebra, Carpetbaggers and the New Vintage, eventually rubbed his love for folk off on Mattson, and they formed the Bitter Spills in 2006. Mattson, a member of the Glenrustles, Ol’ Yeller and the Tisdales, sings and plays acoustic guitar. Johnson also sings while playing acoustic six- or 12-string guitar. He played his first Homegrown in 2002 and hasn’t missed one since. He says he’s bringing the beer bong, as usual.