22D11 · harmonious sound, harmony, consonance

25F32(+49) · song-birds (+ audible means of communication of animal(s): roaring, crying, singing, barking, mewing, neighing, chirping, etc.)

34B131 · bird in a cage

86(ET IN CARCERE DULCIS VOX EST) · proverbs, sayings, etc. (ET IN CARCERE DULCIS VOX EST)