Echosmith is an American pop band formed in 2009, originally from Los Angeles, California. The group consists of siblings Sydney Sierota, Noah Sierota, and Graham Sierota, along with their brother Jamie Sierota, who was part of the band until 2016. They gained popularity with their hit single "Cool Kids," which was released in 2013 and became a chart-topping success. The band's music is characterized by catchy melodies and upbeat rhythms, often blending elements of indie pop and alternative rock. Echosmith has released several albums, including "Talking Dreams" and "Lonely Generation," showcasing their evolving sound and lyrical themes centered around youth and self-discovery.