Question: Gospel Greats is a compilation album of the singer who sings in what genre?
Context: Sandra Faye "Sandi" Patty (born July 12, 1956) is an American Christian music singer, known for her wide vocal range and expressive flexibility which has led music critics to dub her "The Voice". 20 Golden Greats is a 1977 compilation album by Diana Ross & the Supremes, released on the Motown label in the United Kingdom, which spent seven weeks at number one on the UK album charts.  Despite the album's title, the compilation included two tracks that had never been hit singles in the UK: "My World Is Empty Without You" and "Love Is Like an Itching in My Heart".  All the other 18 tracks had made the UK singles chart.  BPI awarded this album with a platinum disc to commemorate sales in the UK of more than £1,000,000 worth of the album.  Motown expanded the track list to include hits from the Supremes after Ross left the trio in 1970, also including her solo work up to 1981 for the 1998 "40 Golden Motown Greats" CD.  The same album artwork was used and this collection earned a gold disc for sales exceeding 100,000 copies. WOW Gospel 2011 is a gospel music compilation album from the award-winning WOW series.  Released on February 1, 2011 (which made it the first annual "WOW Gospel" album in the history of the series not released in January), the double CD album features thirty contemporary gospel hits.  The album cover pays tribute to Philadelphia, Pennsylvania.  The album debuted straight at number one on the Billboard Gospel Albums chart, and peaked at number 29 on the "Billboard" 200 in 2011. Donna Cruz Sings Her Greatest Hits is the second compilation album by the Filipino singer Donna Cruz, released in the Philippines in 2001 by Viva Records.  The album was Cruz's first album not to receive a PARI certification; all of her studio albums and a previous compilation album, "The Best of Donna", were certified either gold or platinum.  Though it was labeled as a greatest hits compilation, several songs on the track listing had not been released as singles, and some of Cruz's singles did not appear on the album. WOW Gospel 2013 is a gospel music compilation album from the award-winning WOW series.  Released on January 29, 2013, the double CD album features thirty contemporary gospel hits.  The album cover pay tribute to Atlanta, Georgia, and it is second "WOW Gospel" album to do so ("WOW Gospel 2007" is the first).  The second Atlanta tribute is based on the 50th anniversary of the March on Washington for Jobs and Freedom and the "I Have a Dream" speech by Martin Luther King, Jr. The album topped out at #1 on the "Billboard" Gospel Albums chart and #43 on the "Billboard" 200 chart. Reggae Greats: Lee "Scratch" Perry is a 1984 Island Records compilation album featuring the work of Lee "Scratch" Perry.  It concentrates mainly on his work as a producer/composer rather than a singer.  Perry only sings on three of the songs.  All of the tracks are from the period between 1976 and 1979 and were recorded at Perry's Black Ark studio.  The album is generally considered a good introduction to Perry's Black Ark work, and is often chosen as the best single album by Perry, but with tracks drawn from Perry's popular late 1970s albums, it has also been described as "not essential" and containing "no surprises". Paul Foster (July 12, 1920 – August 20, 1995) was born in Grand Cane, Louisiana and sang with the legendary gospel group, the Soul Stirrers, from 1950 to 1963.  Foster sang second lead alongside two other gospel greats, Rebert Harris and Sam Cooke.  Foster possessed a powerful, mournful tenor voice, a perfect foil to both Harris' and Cooke's sweeter more-flowery tenor styles.  During his long career in gospel music, Foster also sang for other quartets such as the Rising Stars and the Golden Echoes.  While nearly all of Foster's recordings take place in the recording studio, his powerful voice can be heard on the Soul Stirrers' dynamic performance on the album "The Great Shrine Concert of 1955", especially on the song "Be With Me Jesus", where Foster leads the group with his strong testimonial style. WOW Gospel 2012 is a gospel music compilation album from the award-winning WOW series.  Released on January 24, 2012, the double CD album features thirty contemporary gospel hits.  The album cover pays tribute to Los Angeles, California, with a side tribute to the San Francisco Bay Area on the back album cover notes.  The album peaked at number one on the Billboard Gospel Albums Chart, and number 30 on the "Billboard" 200 chart. Best of the Rest is the compilation album by the American Southern rock band Lynyrd Skynyrd.  It was originally released in 1982 and again in 1990 on CD.  This compilation contains album cuts that are fan favorites.  The only hit from the band on the album is "Call Me the Breeze."  The compilation also contains two previously unreleased early recordings from 1971 and 1972.  Those songs were originally planned to be on their shelved debut album, making "(Pronounced 'Lĕh-'nérd 'Skin-'nérd)" their actual debut.  The early songs were recorded at Muscle Shoals Sound Studio in Alabama.  Other early songs from 1971-72 also surfaced on the compilations "Skynyrd's First and... Last" in 1978 and "Old Time Greats" in 1997. Gospel Greats is compilation of Sandi Patty's greatest hits from the Word catalogue.
Answer: American Christian music