Assuming you listen to it at all, I mean. So with three playable characters, does anyone else listen to the radio stations based on who you are controlling? When I'm on a mission, generally the radio is off for the better ambient music, but for when I'm driving around from thing to thing, I tend to use the driver as the one who decides what radio station I listen to. So if I am playing as Trevor, I might pop on the punk station. If I am Michael, I might pop on the classic rock. And if I'm Franklin, well I'll probably be banging my head to that Radio Mirror Park for all the indie beats.
I dunno, it might sound weird, but I listen to the different radio stations based on the driver. Just seems to add more...I dunno....flavor? Or maybe I'm just some weird roleplayer person. Considering that I'm barely in the car for a full song, it might just be something silly I do.