From the advent of MP3s to the births of Napster, iTunes and the streaming revolution, the shift to digital music forever changed the way we experience music.
The K-Pop quartet's song is the first by a girl group to reach No. 1 on iTunes in the US since Destiny’s Child’s' 'Lose My Breath' in 2004.
Taylor Swift's hotly-anticipated sixth album Reputation has already moved nearly 500,000 copies on pre-sale before its official 10 November release
The full album catalogue of the mighty Metallica has been mastered for iTunes and is now available for download from the iTunes Store.