Dot, When you play the DVD or music CD on your 'puter you can, at the same to, copy it to a USB stick or portable hard drive. This is called ripping. Because it is potentially ripping off someones copyright, apparently.
If you decide to copy some music to a stick, get the best quality stick that you can afford, because the cheap ones fail after a few years. Ask me how I know
It isn't hard. Once someone shows you, you can spend days copying stuff and playing it back through the USB port of your TV or stereo system.