As teenagers, they worked as models but opted to focus on songwriting and production. Their first credits of note came in 2005 through Rachel Stevens' "Negotiate with Love," a single that peaked at number 10 in the U.K. A few years later, they co-wrote David Guetta and Kelly Rowland's "When Love Takes Over," which topped Billboard's U.S. club chart, as well as the main pop charts of several European and Scandinavian countries. It was nominated for a 2009 Grammy in the category of Best Dance Recording. As they continued to add to their résumé as collaborators, the sisters began issuing singles under the name Nervo. 2012's "Like Home," featuring Nicky Romero, peaked at number 33 on the U.K. pop chart, while 2013's "Hold On" topped the U.S. dance chart. ~ Andy Kellman