On June 8, 1966, KOSO signed on the air. It originally broadcast on 93.1 MHz and was powered at 1,100 watts. It was owned by the Sierra-Pacific Radio Corporation, with studios and offices in Modesto. The station previously had an
adult contemporary format and was branded as "KO93". The mainstream AC format continued until the summer of 1995, when the station was rebranded as "B93". As a result, the station shifted to a hot AC format. In 1997, B93 began to transition towards a
modern AC format, adding more
alternative rock-leaning artists such as
Alanis Morissette,
Counting Crows,
Gin Blossoms, and
The Cranberries to its playlist. In 2000,
Clear Channel Communications, the forerunner to today's iHeartMedia, acquired KOSO. Clear Channel needed the station to bring a "move-in station" to the
Sacramento radio market. On June 1, 2009, at midnight, KOSO moved from 93.1 MHz to 92.9 MHz as a result of the start of 93.1 FM KHJQ
Pollock Pines, near Sacramento, which began broadcasting in June 2009. That station today is
KFBK-FM, co-owned with KOSO. On October 2, 2012, KOSO shifted its format to
hot AC, branded as "Radio 92.9". On March 2, 2015, KOSO returned to its "B93" branding. On July 1, 2016, at 12 noon, KOSO changed its format from hot AC to
country music, branded as "92.9 The Big Dog". ==References==