Final answer:
The album 'Let It Be' by The Beatles was produced by Phil Spector. He was brought in after the 'Get Back' sessions were shelved and applied his 'Wall of Sound' production to the existing recordings. The album, released after the band recorded 'Abbey Road,' is often viewed as the band's farewell.
Step-by-step explanation:
The album Let It Be was ultimately produced by Phil Spector. The Beatles originally recorded the album with the working title 'Get Back,' aiming to return to their roots with a more raw and live sound. These sessions were famously fraught with tension and ultimately shelved.
The Beatles went on to record and release 'Abbey Road' before returning to the 'Get Back' tapes. Phil Spector was then brought in to make sense of the existing recordings and added his signature 'Wall of Sound' production style, which included lush orchestrations and choir arrangements.
This notably changed the sound of the recordings, particularly on tracks like 'The Long and Winding Road,' and remains a point of contention for some fans and band members. The 'Let It Be' album was released on May 8, 1970, and is often seen as the swan song for The Beatles, as it was the last album the band released before they disbanded, although it was recorded before 'Abbey Road'.