The soundtrack to 'West Side Story' holds the record for the most weeks at No. 1 on the Billboard 200 with 54 weeks. Michael Jackson's 'Thriller' spent 37 weeks at No. 1, while Fleetwood Mac's 'Rumours' and the 'South Pacific' soundtrack each spent 31 weeks at the top. Harry Belafonte's 'Calypso' also spent 31 weeks at No. 1 in 1956-57.