song in WordNet English dictionary

1. the characteristic sound produced by a bird
   "a bird will not learn its song unless it hears it at an early age"
   birdcall  call  birdsong  song 
   
2. the act of singing
   "with a shout and a song they marched up to the gates"
   song  strain 
   
3. a short musical composition with words
   "a successful musical must have at least three good songs"
   song  vocal 
   
4. 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"
   song 
   
5. a very small sum
   "he bought it for a song"
   song