Chinese American Bear, the Seattle-based duo of Anne Tong and Bryce Barsten, share new single 'Mama (妈妈)' - a new taste of upcoming album Dim Sum & Then Some, out May 8 via Moshi Moshi Records. Inspired by vocalist Anne Tong's childhood family meals, new single 'Mama (妈妈)' is a  nostalgic, warmly…