Echosmith is an American indie pop band formed in February 2009 from Toluca Lake, Los Angeles. The band is composed of three siblings: Graham Sierota, Sydney Sierota, and Noah Sierota. They are best known for their hit song "Cool Kids" which reached number 13 on the Billboard Hot 100. The band's debut album, Talking Dreams, was released on October 8, 2013.