KAAZ-FM began broadcasting on 106.3 MHz as KTMP, the original format mainly being country, from a transmitter on Lake Mountain, closer to its current city of license (Spanish Fork).

It became the original home of KBER in 1986, which moved down the dial to 101.1 MHz in 1990, replacing contemporary jazz KDAB, and relocated its transmitter to Farnsworth Peak.

It was Utah's first sports radio station, as well as the first in the country to broadcast on the FM band.

[5] The station simulcast the country music format of KMXB (107.5 FM, now KKLV).

[6] In December 1993, the station began simulcasting the country music programming of KRGQ (1550 AM) and KRGQ-FM (107.9 FM).

[8] Before flipping to 106.5 MHz, KOSY was simulcast on what is now KEGH in Brigham City to fill in the gaps created from Lake Mountain.

In 2009, due to November 1 landing on a Sunday, KOSY forwent their move and continued airing their usual "Sounds of the Sabbath" that day.