Final answer:
In 1966, the Beach Boys' 'Good Vibrations' and 'Pet Sounds' album introduced groundbreaking recording techniques, complex harmonies, and the use of unconventional instruments, which significantly influenced the evolution of music.
Step-by-step explanation:
In 1966, Brian Wilson and the Beach Boys significantly impacted the music world with their innovative work on 'Good Vibrations' and the album 'Pet Sounds'. These works stand out due to their groundbreaking use of the studio as an instrument, intricate vocal harmonies, and the integration of unconventional sounds and instruments into their music, such as the theremin-like sounds in 'Good Vibrations'.
The album 'Pet Sounds' was pioneering in its emotional depth and the complexity of its arrangements. An example is the notable sound of a train whistle at the end of 'Caroline, No' signifying the use of everyday sounds to enhance musical storytelling.