That's music to my ears.
→   듣던중 반가운소린걸.

[예문]

music은 '음악' 이라는뜻외 '음악처럼듣기좋은 말''아름다운소리'라는뜻.

A:The teacher said we won't have a test today.
  선생님께서 오늘은 시험이 없다고 말씀하셨어.

B:That's music to my ears.
  듣던중 반가운소린걸.