Question: Which Paul McCartney song did Del Davis sing on "Mellow Dubmarine."

full_context: Document 1: A World Without Love (Eddie Rabbitt song): "A World Without Love" is a song co-written and recorded by American country music artist Eddie Rabbitt. It was released in October 1985 as the first single from the album "Rabbitt Trax". The song reached number 10 on the "Billboard" Hot Country Singles & Tracks chart. It was written by Rabbitt, Even Stevens and Phil Galdston.
Document 2: Gordon Waller: Gordon Trueman Riviere Waller (4 June 1945 – 17 July 2009) was a British singer–songwriter–guitarist, best known as Gordon of the 1960s pop music duo Peter and Gordon, whose biggest hit was the No. 1 million-selling classic "A World Without Love".
Document 3: A World Without Love: "A World Without Love" is a song recorded by the English duo Peter and Gordon and released as their first single in February 1964. It was included on the duo's debut album in the UK, and in the US on an album of the same name. The song was written by Paul McCartney and attributed to Lennon–McCartney. The B-side was "If I Were You", written by Peter and Gordon.
Document 4: Love in Song: "Love in Song" is a song credited to Paul and Linda McCartney that was released on Wings' 1975 album "Venus and Mars". It was also released as the B-side of Wings' number 1 single "Listen to What the Man Said." It has been covered by artists such as Helen Merrill and The Judybats.
Document 5: Mr. Davis: Mr. Davis is the eleventh studio album by American rapper Gucci Mane. It will be released on October 13, 2017, by GUWOP Enterprises and Atlantic Records. It is Gucci Mane's second commercial project of the year following the "Droptopwop" (2017) mixtape. The album features guest appearances from Nicki Minaj, Monica, Chris Brown, Migos, The Weeknd, ASAP Rocky, Big Sean, Ty Dolla Sign, Schoolboy Q, among others.
Document 6: Lost Without Your Love (song): "Lost Without Your Love" is a song written and composed by David Gates, and originally recorded by the pop-rock group Bread, of which Gates was the leader and primary music producer. It is the title track of Bread's 1976 album, and became their final Top 10 hit.
Document 7: Jake Davis: Jake Davis (born July 20, 1992) is a singer-songwriter, multi-instrumentalist, and producer from Los Angeles, California. He first gained recognition for his cover of Hozier’s "Work Song" on CandyRat Records. In June 2016, Davis won Santa Monica’s Emerging Artist Competition, securing a spot with Save Ferris and Cibo Matto at the Twilight Concert Series on the Santa Monica Pier.
Document 8: Dub Side of the Moon: Dub Side of the Moon is a dub reggae tribute to the Pink Floyd album, "The Dark Side of the Moon", co-produced by Easy Star All-Stars founder's Michael G (Michael Goldwasser) and Ticklah (Victor Axelrod). "Dub Side of the Moon" has remained on the Billboard Reggae Charts since its release in 2003. Easy Star All Stars released "Dub Side of the Moon: Special Anniversary Edition" on September 16, 2014.
Document 9: Peter and Gordon: Peter and Gordon were a British pop duo, composed of Peter Asher (b. 1944) and Gordon Waller (1945–2009), who achieved international fame in 1964 with their first single, the million-selling transatlantic No.1 smash "A World Without Love". The duo had several subsequent hits in the British Invasion-era.
Document 10: Mellow Dubmarine: Mellow Dubmarine is a double album featuring reggae covers of various Beatles songs. A handful of Wings, Paul McCartney, John Lennon and George Harrison solo tracks are also featured. The tracks compiled were apparently recorded between the late 1960s and 2000. Several songs are covered by more than one artist - for example, there are three versions of "Let It Be". The album is hard to find in stores.
Document 11: Desmond Dekker: Desmond Dekker (16 July 1941 – 25 May 2006) was a Jamaican ska, rocksteady and reggae singer-songwriter and musician. Together with his backing group the Aces (consisting of Wilson James and Easton Barrington Howard), he had one of the earliest international reggae hits with "Israelites" (1968). Other hits include "007 (Shanty Town)" (1967), "It Mek" (1969) and "You Can Get It If You Really Want" (1970).
Document 12: Martha Ellen Davis: Martha Ellen Davis is an emeritus professor from the University of Florida, anthropologist and ethnomusicologist known for her multifarious work on African diasporic religion and music. Professor Davis' research has defied conventional tenets about Haitian and Dominican folk music, and her cultural preservation projects has raised awareness of the significance of the Samaná Americanos' enclave.
Document 13: Del Davis (singer): Del Davis is a reggae singer of the 1970s. His cover of "World Without Love" was featured on "Mellow Dubmarine".
Document 14: Nobody I Know: Nobody I Know is a song written by Paul McCartney (attributed to Lennon–McCartney) which Peter and Gordon recorded in an April 1964 Abbey Road Studio session: Peter and Gordon had had a UK/US #1 hit with the McCartney composition "A World Without Love" and McCartney wrote "Nobody I Know" with the specific intent of providing a follow-up hit for the duo. The track reached #10 UK and #12 US.
Document 15: Beenie Man: Anthony Moses Davis (born 22 August 1973), better known by his stage name Beenie Man, is a Jamaican reggae dancehall recording artist. He is referred to as the world's "King of Dancehall".
ground_truth: World Without Love