A song is a single musical composition that has a melody and, often, words that are sung by a vocalist. The words of a song, as a whole, are called the lyrics, and they may include verses that tell a tale or move a story along, and refrains, or short phrases repeated at the end of each verseA song is a single musical composition that has a melody and, often, words that are sung by a vocalist. The words of a song, as a whole, are called the lyrics, and they may include verses that tell a tale or move a story along, and refrains, or short phrases repeated at the end of each verseA song is a single musical composition that has a melody and, often, words that are sung by a vocalist. The words of a song, as a whole, are called the lyrics, and they may include verses that tell a tale or move a s