I don’t think there’s an AM radio station where I live that still plays music just people blabbing all day or weather. FM has some pretty good stations. Perhaps one reason the car sounds great is you’re not concentrating as hard on the music trying to hear every detail like some do on their high end home systems. Hopefully you’re concentration is more engaged in driving letting the music take a back seat not to mention a lot of music was mastered with listening in the car as the focus.
