Genesis - where the sour turns to sweet, 1969

"The song itself had been in the band’s repertoire for quite some time. They had already recorded it among three other songs in a one-hour session at Regent Studios in London, where many rock legends had recorded, in 1967. Jonathan King had taken them there to record a tape that was sent to Decca Records. The label had been impressed and signed them and King went into the studio with them again, this time to Advision Studios, to produce a reprise of ‘Where The Sour Turns To Sweet’ for their debut single."