25. One Direction
Image Source: Dan MacMedan-USA TODAY NETWORK
One Direction was fully a ‘thing’ for roughly six years. However during this time, the English group exploded into homes of virtually every tween on the planet. It offered the classic boy band set up of two guys (Harry Styles, Zayn Malik) standing out from the rest. It also was a group rooted in turmoil — as Malik left to become a solo artist. The group of 20-somethings have sold over 50 million records worldwide.