My car (see above) has a very good in music system. Very loud. Like lots of modern cars it has a USB socket into which you can plug a memory stick. I’ve been experimenting with the devices to see which work. I bought this amazingly tiny 16G one but it didn’t work. For some reason the car rejected it. However, if I take a 16G SD card and put it in a tiny reader this works a treat. So, if you want to drive around with several day’s worth of music in your car, you might want to try this. The other benefit is that SD cards tend to be somewhat cheaper than USB keys of the equivalent size.