The Q.U.E.E.N of pop is Cher because she is the ONLY FEMALE ARTIST IN RECORDED POP MUSIC HISTORY TO HAVE ALL HER SINGLES CHART IN ALL SIX DECADES. 1960s 1970s 1980s 1990s 2000s & 2010s. Madonna has only had chart success in the 1980s consistently the 1990s was very up & down for her & the 2000s & 2010s decade for Madonna, NEXT!!!!!!!!!