Indie pop band Echosmith was formed in Chino, California in 2009. The band initially consisted of siblings Graham (drums), Sydney (co-lead vocals, keyboard, tambourine), Noah (bass, backing vocals), and Jamie (co-lead vocals, guitar) Sierota, although Jamie left the band in 2016. As children, they were surrounded by music, which inspired them all to start learning musical instruments, writing, and performing.
In 2013, under the management of their father, producer and songwriter Jeffery David, Echosmith was signed to Warner Bros. Records. That April, the band was named by Alternative Press as one of "100 Bands You Need To Know". The following month, they released their debut single, "Come Together," which was featured on their debut EP, Summer Sampler, alongside the songs "Cool Kids", "Come Together", and "Talking Dreams," that June. During the summer months of 2013, the band performed on the Vans Warped Tour and also toured the United States and Canada as the opening act for Owl City on his 2013 Midsummer Station tour.
On October 1, 2013, Echosmith released its debut album, Talking Dreams. The album was buoyed by the success of "Cool Kids" (which hit number 13 on the Billboard Hot 100) and peaked at the top of the Billboard Heatseekers Albums chart, as well as reaching the top 40 of the Billboard 200. That December, they followed with a Christmas single, "I Heard the Bells on Christmas Day," which was released on December 3, 2013. Echosmith was the MTV Push Artist of the Month for November 2014, and at the turn of the year, the band was selected as one of MTV's 2014 Artists To Watch. The band's song, "Surround You" was featured in the soundtrack for the film Endless Love in February 2014. That summer, the band once again played the Vans Warped Tour. In June, they made their late-night TV debut performing "Cool Kids" on Conan and then on the Teen Wolf after-show, Wolf Watch.
2015 saw the band touring as the support act for Twenty One Pilots, as well as headlining a tour in February, with The Colourist in support. In May, they featured on Zedd's track "Illusion", from his second studio album True Colors. That June, they released an acoustic EP, titled Acoustic Dreams, which features acoustic versions of the tracks on Talking Dreams, as well as a new track, "Terminal". The band announced that August that Jamie would be taking some time out from the band to prepare for fatherhood. In November 2016, they announced his permanent departure from the band, who decided to continue as a trio. That year, Sydney collaborated with The Goo Goo Dolls on their song, "Flood", on their album Boxes.
On July 14, 2017, Echosmith released "Goodbye", the lead single to their upcoming sophomore album. One week later, they performed the track live for the first time at the 2017 MTV Fandom Awards during San Diego Comic-Con. "Goodbye" was followed in the summer by the singles "Future Me" and "Dear World". In lieu of their upcoming album, which was delayed, the band released their third EP, Inside a Dream, on September 29, 2017, featuring the single "Get Into My Car".
In March 2018, the band released a new lead single, "Over My Head," marking the abandonment of their proposed second album. Later that summer, the band opened for Pentatonix on their tour. 2019 was a year for collaboration for the band – in March, they released the single "Favorite Sound," a collaboration with musician Audien, and later in the year they worked on a remix cover of "God Only Knows" with For King and Country.
The band's second studio album, Lonely Generation, was released on January 10, 2020, via their Echosmith Music label under Warner Music Group.