For most of the day our 'radio' (KLove online radio) is on. So, it's no wonder when my kids are very familiar with all the songs from the stations. If the radio is off, I even find them singing or humming the songs that they've heard.
It's nice to expose the kids to different types of music. During homeschool hours, we usually turn on the classical music. But if given an option, they like to listen to the contemporary songs rather than the classical ones. As of now, my kids just appreciate music. I'm not sure when they will have more interest to play musical instruments and would want to visit Musicians friend.