Question: Q: Who as collaborated musically with both Leo Abrahams and Art Garfunkel?
Context: Two Can Dream Alone is a compilation album by folk rock duo Simon & Garfunkel.  The album is a collection of songs from before they recorded their debut album "Wednesday Morning, 3 A.M.".  It also has solo recordings by both Paul Simon and Art Garfunkel during this era of their careers.  It contains all of Simon & Garfunkel's singles from these years.  Six years after its release, a similar album was released which contains all Paul Simon songs except for "Beat Love" by Art Garfunkel, which appears on both albums.  The songs on that album are also from their early years. The Art Garfunkel Album (re-titled My Best in Germany) is the first compilation album by Art Garfunkel released in 1984.  It showed the first eleven years of his career by compiling all of his greatest hits.  Among the fourteen tracks, a new single "Sometimes When I'm Dreaming" was included on the album. Recorded as Jerry Landis is a compilation album of music by singer, songwriter, and guitarist Paul Simon, released in 2006.  This album contains 18 songs recorded before Simon & Garfunkel released their first album, "Wednesday Morning, 3 A.M.".  All songs are by Paul Simon except the song "Beat Love", which is a contemporary recording by Art Garfunkel, recorded under the name "Artie Garr".  This album was released six years after an album of Simon & Garfunkel songs, from the same era, that contained a mix of Simon & Garfunkel recordings (under the name "Tom & Jerry"), and Paul Simon and Art Garfunkel songs.  He recorded many of the songs on these albums under different aliases, such as "Jerry Landis", "True Taylor" and "Paul Kane". Leo Matthew Abrahams (born 1977 in Camden, London) is an English musician, composer and producer.  He has collaborated with a multitude of professional musicians, including Brian Eno, Imogen Heap, Jarvis Cocker, Carl Barât, Jon Hopkins and Paul Simon.  After attending the Royal Academy of Music in England, he started his musical career by touring as lead guitarist with Imogen Heap.  Since 2005 he has released five solo albums, largely in an ambient style involving complex arrangements and a use of guitar-generated textures.  He has also co-written or arranged a variety of film soundtracks, including Peter Jackson's 2009 release "The Lovely Bones" and Steve McQueen's "Hunger". "My Little Town" is a 1975 song by the American duo Simon & Garfunkel.  It was written by Paul Simon, who produced the track along with Art Garfunkel and Phil Ramone.  Although the song would not appear on any of the duo's albums until later, it was included on both the solo releases for Simon ("Still Crazy After All These Years") and Garfunkel ("Breakaway") in 1975.  This song was the first new single for Simon & Garfunkel since 1972's single hit "America".  It became an all-new Simon & Garfunkel reunion single. Everything Waits to be Noticed is the ninth solo studio album by Art Garfunkel, although the album is actually a collaboration within a trio setting featuring singer-songwriters Maia Sharp and Buddy Mondlock.  Credited to "Art Garfunkel With Maia Sharp & Buddy Mondlock", the album is Garfunkel's debut as a songwriter, co-writing six songs, and was produced by Billy Mann.  It is his first release on Blue Note Records after years of recording for Columbia Records. Angel Clare is the debut solo studio album by Art Garfunkel, released on September 11, 1973.  It is his highest charting solo album, peaking at number 5 and contains his only Top 10 hit in the US, "All I Know" which peaked at number 9.  It also contained two other Top 40 hits, "Traveling Boy" (#102 Bubbling under the Hot 100, #38 Adult Contemporary) and "I Shall Sing" (#38 Hot 100, #4 Adult Contemporary).  It was produced by long-time Simon & Garfunkel producer Roy Halee, alongside Art Garfunkel. "Sometimes When I'm Dreaming" is a song from Agnetha Fältskog's 2004 comeback album, "My Colouring Book".  The song was written by Mike Batt, the writer of songs for The Wombles and was originally recorded by Art Garfunkel for his album The Art Garfunkel Album.  Katie Melua also covered this song on the "Piece By Piece (Special Bonus Edition)" album. Paul Frederic Simon (born October 13, 1941) is an American musician, singer-songwriter and actor.  Simon's musical career has spanned seven decades, with his fame and commercial success beginning as half of the duo Simon & Garfunkel, which was formed in 1964 with Art Garfunkel.  Simon was responsible for writing nearly all of the pair's songs, including three that reached No. 1 on the U.S. singles charts: "The Sound of Silence", "Mrs. Robinson", and "Bridge over Troubled Water". Lefty is the seventh solo studio album by Art Garfunkel, released in 1988.  The album features three songs by singer-songwriter Stephen Bishop.  The album's cover photo shows a pre-teen Art Garfunkel holding a baseball bat in the front yard of his childhood home in the Forest Hills section of Queens, New York City.  It was taken by his brother Jules.  The album title came from the fact that Garfunkel is left-handed, which the picture established.
Answer: Paul Simon