Previously, AMP Radio was heard on KCBS-FM HD2 and also streamed online; it launched on February 21, 2008. The station had targeted teens and young audiences by playing a mix of popular child friendly artists such as Miley Cyrus, the Jonas Brothers, and songs from the High School Musical soundtrack and Top 40 artists (Chris Brown, Paramore, Rihanna and Metro Station). Eventually, AMP more closely resembled a more mainstream Top 40 format and it was advertised the station on many of the company's radio station websites. The company stated that testing AMP Radio on HD and online showed brand loyalty and the success of the format.