For the early part of the Beach Boys' career, all of their singles were mixed and mastered and released only in the mono format &emdash; they didn't release a single in stereo until 1968. In those days, hits were made on AM radio in mono. And the mono of those times worked well for Wilson, who suffers from partial deafness. In fact, for their first 13 albums, Wilson originally turned in all the final mixed Beach Boy albums to Capitol Records only in mono. The mono mixes were where Wilson paid intense attention, and the dedication paid off!