The definition of a song is a musical piece, or the sounds of some animals such as birds.(noun)
An example of songs are "Silent Night," "Unchained Melody" and "I Can't Help Falling in Love with You."
See song in Webster's New World College Dictionary
Origin: ME < OE sang: for IE base see sing
See song in American Heritage Dictionary 4
Origin: Middle English
Origin: , from Old English sang; see sengwh- in Indo-European roots.
Origin: Chinese (Mandarin) Sòng
Origin: , named after Sòng prefecture by its founder Zhao Kuangyin, where he was conferred his title.
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