The station had a classical music commercial format at its inception on 25 June 1998. The station was the first successful commercial classical music station in Montreal, following the failure of CJRM-FM in 1968 and decades of reluctance since then by the CRTC to allow such a station to go on the air. It was conceived in the 'Top 40 classics' style of Radio-Classique in France, or Classic FM in the UK.
In December 2014, it was announced that CJPX and its Quebec City sister station CJSQ-FM would be sold to Groupe Musique Greg, a company founded by Charles. Charles' offer to buy the two stations came in response to rumours that former owner Jean-Pierre Coallier was looking to retire and sell them.