[ALL] Music channels

I'm an old guy. 28, but unfortunately,thats celcius. My wife and I love channel 422. Or should we say we did. A couple of months ago this "easily listeneng" channel staarted playing some awful nonsense. Part Jazz, part ??? All the lovely stuff that was there was replaced with this nonsense. Night before last and last night they reverted to the wonderful sound. tonight we are back to the drivel. Who can I contact and how do I do it to express our extreme dissapointment?