Final answer:
The Beatles released 'Revolver' as the follow-up album to 'Rubber Soul' in 1966, which included tracks such as 'Eleanor Rigby' and 'Tomorrow Never Knows' that showcased a more experimental and psychedelic influence.
Step-by-step explanation:
The album that The Beatles released as a follow-up to Rubber Soul was Revolver. After the 1965 release of Rubber Soul, The Beatles continued to push the boundaries of popular music with Revolver, which came out in 1966. This album showcased a maturation in their songwriting and musical style, featuring more experimental and psychedelic influences, moving away from their earlier pop-rock sound. Revolver includes tracks such as "Eleanor Rigby" and "Tomorrow Never Knows", marking a significant evolution in The Beatles' music and heralding the psychedelic era of rock.