What song written by Lorde and Joel Little topped the Billboard" Alternative Songs chart in 2013?
Mother Mother (song):  It was the last song by a female solo artist to top this chart until "Royals" by Lorde in August 2013, by which time the chart had been renamed "Billboard" Alternative Songs. Royals (song):  Written by Lorde and Joel Little and produced by the latter, the song lyrically disapproves of the luxurious lifestyle of contemporary artists.
"Royals"