"Love's Theme" is an instrumental piece written by Barry White in around 1965.
Recorded and released as a single by White's The Love Unlimited Orchestra in 1973, it was one of the few instrumental and purely orchestral singles to reach #1 on the Billboard Hot 100 chart in the United States, which it did in early 1974. Billboard ranked it as the #3 song for 1974.
"Love's Theme" was included on two albums: 1973's Under the Influence of... Love Unlimited (by the vocal group Love Unlimited) and 1974's Rhapsody in White by the Love Unlimited Orchestra. The recording (with a large string orchestra, modified guitar and big rhythm) was considered to be an influence on the disco sound, which would increase popularity the following year.
The song was also popular on the Adult Contemporary chart in the United States (spending two weeks at #1) and was also a #1 on Cash Box.
In Canada, the single was similarly successful, being a #1 on the RPM 100 National Singles Chart on March 2, 1974.