Peter, Paul and Mary is the self-titled debut studio album by American folk trio Peter, Paul and Mary was released in March 1962 on Warner Bros. Records. Released in both mono and stereo on catalog no. 1449, it is one of the rare folk albums to reach No. 1 on the Billboard chart in the US, where it remained for over a month. The lead-off singles "If I Had a Hammer" and "Lemon Tree" reached numbers 10 and 35 respectively on the Billboard Pop Singles chart. It was the group's biggest selling studio album, eventually certified Double Platinum by the Recording Industry Association of America for U.S. sales of more than two million copies. No. 1 on the Billboard 200 for 1 week, from the issue of October 26, 1963. Wiki link