Beach Boys' Party! Was the tenth studio album by The Beach Boys and was mostly cover songs. When originally recorded, the band invited friends and family into the studio for a party. Those sounds were then layered over the recorded music for a true party sound. Uncovered and unplugged now strips away those party sounds so that the true sessions can be heard in their entirety.
The Beach Boys, "Beach Boys' Party! Uncovered and Unplugged"