A.M. Sixty (also known as AM60) is an indie pop group led by Chris Root. In 2001, he formed the group A.M. Sixty, which became a phenomenon in the United Kingdom after Root sent UK labels some of his demos. His single, "Just a Dream", hit the UK charts and resulted in A.M. Sixty doing a Peel Session. After touring stadiums in Europe and Japan, A.M. Sixty signed with V2 Records, releasing the album Big as the Sky in 2004. Old Navy used their song Summertime Girlfriend in 2005 as part of their summer fashion line.