Question: What number-one single by Eric Clapton was written by Bob Marley and released in 1973 by The Wailers? 
Context: Bob Marley and the Wailers were a Jamaican reggae band created by Bob Marley.  The band formed when self-taught musician Hubert Winston McIntosh (Peter Tosh) met Neville Livingston (Bunny Wailer), and Robert Nesta Marley (Bob Marley) in 1963 and taught them how to play guitar, keyboards, and percussion.  By late 1963 Junior Braithwaite, Beverley Kelso, and Cherry Smith had joined the Wailers.  After Peter Tosh and Bunny Wailer left the band in 1974, Bob Marley began touring with new band members.  His new backing band included brothers Carlton Barrett and Aston "Family Man" Barrett on drums and bass respectively, Junior Marvin and Al Anderson on lead guitar, Tyrone Downie and Earl "Wya" Lindo on keyboards, and Alvin "Seeco" Patterson on percussion.  The "I Threes", consisting of Judy Mowatt, Marcia Griffiths, and Marley's wife, Rita, provided backing vocals. The singles discography of Eric Clapton consists of 24 early career singles that Clapton recorded with various bands and artists including The Yardbirds, John Mayall & the Blues Breakers, Cream, John Lennon and the Plastic Ono Band as well as Derek and the Dominos.  As a solo artist, Clapton released 91 singles and various promotional formats from 1970 to date.  His commercially most successful singles are "Lay Down Sally", "Wonderful Tonight", "Change the World", "Tears in Heaven" and the cover of Bob Marley's "I Shot the Sheriff", released in 1974, that actually outplayed the original release, becoming a "Billboard" Hot 100 number-one hit.  Clapton's best-selling single is "Wonderful Tonight" which has sold more than four million copies worldwide, although he is most known for his rock anthem "Layla", that was originally released in 1971.  Clapton later covered the song acoustically for his 1992 "Unplugged" million-seller, and helped to cement Clapton's reputation as both a guitarist and singer.  The British rock musician also collaborated with friends along his extensive solo career.  Featured singles with artists like Elton John, Sting, Cher, Chrissie Hynde, Neneh Cherry and Zucchero Fornaciari helped to uplift Clapton's single performances. Bob Marley and the Wailers were a Jamaican reggae band led by Bob Marley which developed from the earlier ska vocal group, the Wailers, created by Marley with Peter Tosh and Bunny Wailer in 1963.  By late 1963 singers Junior Braithwaite, Beverley Kelso, and Cherry Smith had joined the Wailers.  By the early 1970s, Marley and Bunny Wailer had learned to play some instruments and brothers Aston "Family Man" Barrett (bass) and Carlton Barrett (drums), had joined the band.  After Bunny Wailer and Peter Tosh left the band in 1974, Marley began touring with new band members.  His new backing band included the Barrett brothers, Junior Marvin and Al Anderson on lead guitar, Tyrone Downie and Earl "Wya" Lindo on keyboards, and Alvin "Seeco" Patterson on percussion.  The "I Threes", consisting of Judy Mowatt, Marcia Griffiths, and Marley's wife, Rita, provided backing vocals. Natty Dread is a 1974 album by Bob Marley and the Wailers.  It was the first album released as Bob Marley and the Wailers instead of just the Wailers, the first recorded without Peter Tosh and Bunny Wailer, and the first recorded with the I Threes, a female vocal trio consisting of Marcia Griffiths, Judy Mowatt, and Marley's wife, Rita Marley. Talkin' Blues is a live album by Bob Marley & The Wailers, released in 1991.  It contains live studio recordings from 1973 and 1975 intercut with interview segments of Bob Marley.  The majority of tracks are taken from the recordings Bob Marley & The Wailers did on 31 October 1973, at The Record Plant for San Francisco radio station KSAN.  They include "You Can't Blame the Youth", sung by Peter Tosh, and "Get Up, Stand Up" with Bob Marley and Peter Tosh alternatingly taking lead vocals.  The remaining songs are taken from a performance at The Lyceum Theatre in London and interview segments from Jamaican radio in 1975. "Give Me Strength" is a blues pop song, written and recorded by the British rock musician Eric Clapton for his 1974 hit studio album "461 Ocean Boulevard" under RSO Records.  However, the song gained more popularity, when the record company released the song as the B-side to Clapton's number-one single "I Shot the Sheriff", before the studio effort was released.  It was released as a seven-inch grammophone record. Most of Bob Marley's early music was recorded with Peter Tosh and Bunny Wailer, who together with Marley were the most prominent members of The Wailers.  In 1972, The Wailers had their first hit outside Jamaica when Johnny Nash covered their song "Stir It Up", which became a U.K. hit.  The 1973 album, "Catch a Fire", was released worldwide, and sold well.  It was followed by "Burnin'" which included the song "I Shot the Sheriff", of which a cover version by Eric Clapton became a hit in 1974. Burnin' is a reggae album by The Wailers, released in 1973.  The sixth album by Bob Marley, Peter Tosh and Bunny Wailer (the last before Tosh and Bunny departed for solo careers and the band became known as Bob Marley and the Wailers), "Burnin' " opens with a signature song, the call to action "Get Up, Stand Up" and includes a more confrontational and militant tone than previous records, such as in another Marley standard turned into a number one hit by Eric Clapton, "I Shot the Sheriff".  The songs "Duppy Conqueror", "Small Axe", "Put It On" and "Pass It On" are re-recordings of songs previously released. "I Shot the Sheriff" is a song written by Bob Marley and released in 1973 by The Wailers. "Hammer" is a song by Bob Marley.  It was first recorded early in Marley's career (probably 1968) but never appeared on the Bob Marley & The Wailers studio albums in the seventies.  JAD Records ultimately released remastered versions of the early studio sessions of Bob Marley & Wailers; "Hammer" is included on "Fy-ah, Fy-ah" and a Sly and Robbie remix of the song is included on "Man To Man".  A version of the song also appears on the box-set "Songs of Freedom".
Answer: I Shot the Sheriff