 1449, It is one of the rare folk albums to reach US#1 - staying 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.