The success of the Kingston Trio in its heyday had repercussions far beyond its voluminous album sales (including four albums simultaneously in the Top 10 in 1959), its host of imitators, and the relatively short-lived pop-folk boom it created. For the Kingston Trio's success took acoustic folk-based music out of the niche market it had occupied prior to the Trio's arrival and moved it into the mainstream of American popular music, opening the door for major record labels to record and market both more traditional folk musicians and singer-songwriters as well.