This station first began broadcasting in January 1984 under the call sign KLSK with a classical music format that would later feature various other forms of music such as jazz, new age, folk and world music. In February 1990, KLSK would be sold to Progressive Broadcasting co-owned by programmer John Sebastian for $2 million. The station's format would then be focused mostly on new age music with the other genres being phased out. The effort however only lasted a few months. On January 23, 1991, KLSK would stunt with a loop of Led Zeppelin's "Stairway to Heaven" for 24 hours. The next day, it would launch a classic rock format, becoming the first station in Albuquerque to feature that format full-time. The station would quickly rise to the top 5 in the ratings and would do well for few years. In June 1993, Progressive Broadcasting would merge with Sandia Peak Broadcasters, which was a subsidiary of TV broadcaster Anchor Media, owners of KZRR and simulcast KZSS, and would become "Twin Peaks Radio", with studios on San Pedro NE north of Menual. Anchor Media was acquired by River City Broadcasting about a year later, and River City inherited the radio stations in Albuquerque. Despite expanding further into radio by buying Keymarket Communications, the Albuquerque stations were told to Trumper Communications in 1996, which had recently acquired KTEG and KHTZ and two AM stations from Bengal Communications. By the mid-1990s, KLSK would see a great deal of competition from other stations, most notably KIOT. Several programming changes would take place over the years, including re-branding as "Eagle 104" in 1998. The format on 104.1 ended in late June 2002, and was moved to 98.1 FM in Santa Fe. The long-time KLSK call sign was first moved to the Las Vegas station vacated by KBAC, but was dropped when the KBAC calls were moved back. They are now being used on an FM station in Great Falls, Montana.