Eddie Jefferson was an American jazz vocalist and lyricist. He is credited as an innovator of vocalese, a musical style in which lyrics are set to an instrumental composition or solo. Jefferson himself claims that his main influence was Leo Watson. Perhaps Jefferson's best-known song is "Moody's Mood for Love" which was recorded in 1952, though two years later a recording by King Pleasure catapulted the contrafact into wide popularity. Jefferson's recordings of Charlie Parker's "Parker's Mood" and Horace Silver's "Filthy McNasty" were also hits.