Million Selling Singles: '00s
Apple Music
Love and madness have long provided rich veins of inspiration for pop songwriters—especially when there's some overlap between the two. Those themes dominated the best-selling songs in the first decade of the 21st century, from Lady Gaga's surreal rhapsodies and Kylie Minogue's space-age disco to Kings of Leon's southern comfort and Gnarls Barkley's plaintive soul.