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What is lyric? Wikipedia says:
Lyrics (in singular form Lyric) are a set of words that accompany music, either by speaking or singing. The word Lyric derives from the Greek word for a song sung by the lyre, lyrikos.

The word lyric came to be used for the words of a song; this meaning was recorded in 1829.[2] The common plural (perhaps because of the association between the plurals lyrics and words), predominates contemporary usage. Use of the singular form lyric remains grammatically acceptable, yet is considered erroneous in referring to a singular song word as a lyric.[verification needed] The sung words of a song are called lyrics.