"Sylvia" is a song by Elvis Presley from his 1972 album Elvis Now, being the penultimate song recorded on the last day of the prolific Nashville recording sessions in June 1970 (which yielded a total of more than 30 songs, spread over several albums).

For some reason RCA Victor (possibly considering it as a single candidate) did not include the song either on Thats The Way It Is album in 1970 or on Love Letters from Elvis album in 1971, though it was recorded during the same sessions and was thematically appropriate for both these albums. It eventually appeared on Elvis Now in 1972. However, the 2008 FTD re-release of Love Letters from Elvis contained the master version of the track (known as Take 8) as well as all its outtakes.

In 1972, the song reached the top of the charts in Brazil.
~Source: Wikipedia