Question: Olivia Newton-John's song Magic was displaced from the top by Sailing, which is by what American singer-songwriter from San Antonio, Texas?
Context: Magic: The Very Best of Olivia Newton-John is a 2001 greatest hits compilation from Olivia Newton-John.  This was the first compilation from Newton-John to include all 15 of her Top 10 hits on the "Billboard" Hot 100 and the first Newton-John album to include "The Grease Megamix". After Dark is an album by Andy Gibb.  It was his final studio album, and was released in 1980.  It features his last US Top 10 single "Desire", "I Can't Help It" (a duet with Olivia Newton-John) and two Bee Gees numbers "Rest Your Love on Me" (duet with Olivia Newton-John) and "Warm Ride". Christopher Cross (born Christopher Charles Geppert; May 3, 1951) is an American singer-songwriter from San Antonio, Texas. "Magic" is a 1980 song performed by Olivia Newton-John, from the soundtrack to the film "Xanadu".  The song was number 1 on the US "Billboard" Hot 100 for four weeks beginning on August 2, 1980.  On August 30, it was displaced from the top by "Sailing" by Christopher Cross.  It was her 25th American chart hit, and her 10th of 12 records which went Gold or higher. Olivia Newton-John: Gold is a double album of Olivia Newton-John's greatest hits, released in 2005.  It contains all but one of her solo "Billboard" Hot 100 hits (excluding "I Need Love") and is the first CD to contain the track "Fool Country" (a B-side to "Magic" and contained in the film "Xanadu", but not available on the soundtrack).  The album is considered the most thorough of all of Newton-John's many compilation albums. If Not for You is the debut studio album by British-Australian singer-songwriter Olivia Newton-John, released in November 1971 by Festival Records.  The album was released on the Pye International label in the UK as "Olivia Newton-John", with a slightly different cover.  As a covers album, "If Not for You" features mostly songs previously recorded from contemporary artists of the 1960s and early 1970s.  She made several performances to promote "If Not for You" and her follow-up album, "Olivia", including an international tour with British singer Cliff Richard.  It was her first album released by Festival Records, which would release all her albums in Australia until its dissolution in 2005.  It also has Newton-John's first works with her long-time musical partner, John Farrar. Physical is the ninth full-length studio album by British-Australian singer-songwriter Olivia Newton-John, released on 13 October 1981 by MCA Records.  The album was produced and partly written by her long-time record producer John Farrar.  Recorded and mixed at David J. Holman's studio in Hollywood, California, "Physical" became one of Newton-John's most controversial and sexual records, and her most successful studio album to date.  Musically, the album features considerable use of synthesizers and explores lyrical themes such as love and relationships, sex, kinesthetics and environmental protection.  Upon its release, the album received generally positive reviews from music critics, many of them considering it to be Newton-John's best work.  The album charted high in several countries, including the United States, Japan and Newton-John's native Australia, becoming one of the most successful albums of the early 1980s.  It also ranks among the best-selling albums by Australian solo artists, selling more than ten million copies worldwide. John Clifford Farrar ( ; born 8 November 1945) is an Australian-born music producer, songwriter, arranger, singer and guitarist.  As a musician, Farrar is a former member of several rock and roll groups including The Mustangs (1963–64), The Strangers (1964–70), Marvin, Welch & Farrar (1970–73), and The Shadows (1973–76); in 1980 he released a solo eponymous album.  As a songwriter and producer he worked with Olivia Newton-John from 1971 to 1989.  He wrote her number-one hit singles: "Have You Never Been Mellow" (1975), "You're the One That I Want" (1978 duet with John Travolta), "Hopelessly Devoted to You" (1978), and "Magic" (1980).  He also produced the majority of her recorded material during that time including her number-one albums, "If You Love Me, Let Me Know" (1974), "Have You Never Been Mellow" (1975) and "Olivia's Greatest Hits Vol.  2" (1982); and he was a co-producer of "" (1978) – the soundtrack for the film of the same name.  Farrar also produced Newton-John's first United States number-one hit single, "I Honestly Love You", which was awarded the Grammy Award for Record of the Year in 1975.  In 1969 Farrar married fellow Australian singer, Pat Carroll – formerly Newton-John's singing partner.  In July 1970 Farrar and Carroll relocated to the United Kingdom and from late 1975 they have resided in the US.  They are the parents of Sam Farrar (Phantom Planet bassist and Maroon 5 touring member) and Max Farrar (Golden Ghost guitarist and keyboardist). Totally Hot is Olivia Newton-John's ninth US and tenth international studio album.  Released in November 1978, it became her first solo Top 10 (No. 7) album since 1975's "Have You Never Been Mellow".  Dressed on the album cover all in leather, Newton-John's transformation was seen to mirror her character Sandy's transformation in "Grease".  The album's singles "A Little More Love" (No. 3 Pop, No. 94 Country, No. 4 AC), "Deeper Than the Night" (No. 11 Pop, No. 87 Country, No. 4 AC), and the title track (No. 52 Pop) all demonstrated a more aggressive and uptempo sound for Newton-John.  (The "Totally Hot" single was remixed for commercial release, adding an instrumental bridge that lengthened the song by over thirty seconds from the original album track.  As well, "Deeper Than the Night" was remixed to 4:56 and released in Europe on a 12" disco single format.)  Newton-John filmed promotional videos for all three singles and wrote two of the album's tracks, "Borrowed Time" and "Talk to Me". Olivia Newton-John's Greatest Hits (1977) was the first compilation album released by Olivia Newton-John in the United States.  (In some other regions, Newton-John released a 1974 compilation, "First Impressions".  This album was therefore marketed instead as "Greatest Hits Vol.  2" and featured a different track listing.)  The album collected all of Newton-John's American Top 40 singles released between 1971 and 1977.  "Changes" was the only track not released as a single, but it was one of Newton-John's first self-written songs that she recorded.  The album was Newton-John's first platinum certification peaking No. 13 Pop and No. 7 Country.  It ended up being certified double Platinum in the US and Platinum in the UK and Canada, and also Gold in Hong Kong.
Answer: Christopher Cross