I tried this decades back with a (then) expensive Hughes HeNe laser, a 20x microscope eyepiece for beam focusing and a phototransistor detector feeding a HeathK

I tried this decades back with a (then) expensive Hughes HeNe laser, a 20x microscope eyepiece for beam focusing and a phototransistor detector feeding a HeathKit audio amp. The laser spot size covered about three grooves. But for playing three grooves at once, it sounded good enough to be interesting. Didn't follow up, however.