WKOS (104.9 FM), branded as "Nash FM 104.9", is a radio station serving the Tri-Cities, Tennessee, area with country music. This station is under ownership of Cumulus Media.
This station was WGAT-FM Mar. 13, 1979, WZXY on Oct. 14, 1981, and changed to its current letters on July 1, 1991.
In the early 1980s, WGAT-FM became WZXY, an AOR station with the nickname "Y-105". Sometime in the mid to late 1980s, WZXY changed formats from AOR to CHR/Top 40. Through much of the 1990s and a large part of the 2000s the format was Oldies as in ("Good Times Great Oldies") and then adult hits. The station was called "The Peak" when it changed to hot adult contemporary.
On February 24, 2012 WKOS changed their format to country, branded as "Great Country 104.9".
On July 3, 2013 at 3:00PM EDT WKOS re-branded itself as "Nash FM 104.9".
In 2007, the East Tennessee State University men's basketball Team moved its games from WJCW to WKOS. This marked the first time the team was heard on FM radio. This has since been moved to AM 640 WXSM, a sister station. 
Coordinates: 36°33′14″N 82°27′00″W / 36.554°N 82.450°W