PEAK POSITION: Number 7 in March 2016 (Chart History)
COMBINED SALES: 1.2 million (March 2018)
RELEASE DATE: December 2015
WHEN DID IT REACH ONE MILLION SALES: January 2017 (estimated)
Major Lazer released Light It Up just before Christmas in 2015. The single slowly climbed up the chart and eventually reached Number 7 in March 2016.
The single did not climb any higher but it was in the chart for 47 weeks including five in the Top Ten.
The song was streamed in its millions, and in September 2017 combined sales were 1.13 million which included 886,000 equivalent stream sales and around 243,000 downloads Therefore I estimate that the millionth sale was in around January 2017.