Brian Wilson, the mastermind behind The Beach Boys, redefined pop music with the 1966 album 'Pet Sounds.' Moving away from simple surf rock, Wilson used the studio as an instrument, incorporating unconventional sounds like bicycle bells, dog whistles, and Coke bottles. His complex vocal harmonies and sophisticated arrangements influenced Paul McCartney to create 'Sgt. Pepper's Lonely Hearts Club Band.' However, Wilson's mental health declined during the aborted 'Smile' sessions, leading to decades of reclusion. His struggle with auditory hallucinations and the pressure of genius made him a tragic figure in rock history. Despite these challenges, Wilson is hailed as one of the greatest composers of the 20th century, proving that pop music could achieve the complexity and emotional depth of classical compositions.