How can I listen to music in my car?

Ross has ripped all his CDs so he can enjoy the mp3s in his car with an external hard drive. Leo says that is cool, but hard drives have the same problem as a record player, they will skip when jostled. So if you hit a bump, the hard drive could skip, and that could damage your hard drive. Leo recommends a solid state solution like a thumb drive or SSD drive in an external enclosure. Or you can put the music up in the cloud and just stream it from your mobile phone through the car's bluetooth connection. Then you can listen to all your music from the cloud, or stream from a service like Spotify.