CHLX was licensed by the CRTC in 2001, and launched on September 23, 2002.
It was briefly branded as Classique 97,1 before becoming Couleur FM, airing classical music. In 2008, after a license amendment was accepted by the CRTC, it became Planète 97,1, an adult contemporary-formatted station, with 20% of its airtime devoted to jazz.
On July 11, 2014, it was announced that CHLX would flip to Hot AC as 97.1 Rythme FM on August 25th, as part of a licensing deal between Cogeco and RNC. CHLX became the first non-Cogeco station to carry the Rythme FM format (other than CJEC-FMQuebec City, which was briefly affiliated with Rythme FM after being sold by Cogeco to another broadcaster). As of October 2014, it still broadcasts two hours a day of jazz music.