The Everly Brothers (Don Everly, born Isaac Donald Everly February 1, 1937, Brownie, Muhlenberg County, Kentucky, Phil Everly, born Phillip Everly, January 19, 1939, Chicago, Illinois) are male siblings who were top-selling country-influenced rock and roll performers, best known for their steel-string guitar playing and close harmony singing.

The Everlys are the most successful charting U.S. rock and roll duo on the Hot 100. Their greatest period of chart success came between 1957 and 1964.

Their father Ike Everly was a musician in his own right. Ike, along with Merle Travis, Mose Rager, and Kennedy Jones, was honoured by the construction of The Four Legends Fountain in Drakesboro, Kentucky.

The brothers were both competent guitarists, and used a simple style of harmony mostly based on parallel thirds. With this approach, each line can often stand on its own as a plausible melody line.

This is in contrast to classic harmony lines which, while working well alongside the melody, would sound strange if heard by themselves. One of the best examples of their close-harmony work is their recording of "Devoted to You".

The duo's approach to harmony singing had a strong influence on the rock and roll groups of the 1960s. For example, both The Beatles and The Beach Boys developed their early singing style by performing Everlys covers.

The Beatles based the vocal arrangement of their song "Please Please Me" directly upon that of "Cathy's Clown."