Art Garfunkel's career could quite easily never have happened.
After starting to make records with his childhood friend Paul Simon in the late 1950s under the moniker Tom & Jerry, Garfunkel went back to college to complete a Bachelor of Arts at Columbia.
The pair reunited in the mid-1960s, called themselves Simon & Garfunkel and released an album of folk songs written by Simon titled Wednesday Morning, 3am in 1964.
It went nowhere, so they parted ways again. Garfunkel focused on his studies (he eventually took a Masters in mathematics) and Simon headed for the folk circuit in London.
But their producer, emboldened by the chart success of the likes of Bob Dylan, plucked a track from that first album, Sounds of Silence, remixed it and re-released it as a single. It went to No1.
Simon & Garfunkel went on to become one of the industry's most successful duos, based on Simon's song-writing skills and Garfunkel's wispy tenor vocals. Song such as I am a Rock and Mrs Robinson sold millions worldwide.
Their 1970 album, Bridge Over Troubled Waters, proved to be their most successful - its title track and The Boxer both topped the charts - but it also proved to be their last together, as professional and personal differences began to strain their relationship.