I recently discovered something wonderful while walking in the Korean mountains.Birds are not just birds. They are singers!And after listening to them carefully, I have my own little ranking.My favorite is the Chinese grosbeak, or Milhwaburi in Korean.밀화부리.Its song is clear, delicate, and musical.When I hear it, I don't feel like I'm listening to a bird.I feel like I'm sitting in a tiny concert ..