definition of
song

[1] #1 song n. [vocal] a short musical composition with words; "a successful musical must have at least three good songs". wn

[2] #2 song n. a distinctive or characteristic sound; "the song of bullets was in the air"; "the song of the wind"; "the wheels sang their song as the train rocketed ahead". wn

[3] #3 song n. [strain] the act of singing; "with a shout and a song they marched up to the gates". wn

[4] #4 song n. [birdcall, call, birdsong] the characteristic sound produced by a bird; "a bird will not learn its song unless it hears it at an early age". wn

[5] #5 song n. a very small sum; "he bought it for a song". wn