Let's not forget out old flash drive friends. You can store a lot of data on them nowadays, and some are so fast they're basically USB 3.0-connected SSDs. If you don't want to go through the hassle of syncing, you can just keep all your music on a hard drive or flash drive, them move it around from computer to computer. Sure, this may not be an ideal option but it prevents any syncing problems because technically the files only reside in one location. Depending on the size of your music library, you may be able to get away with a pretty small drive that doesn't stick out of your computer much at all. If that's the case, storing your library on an externally can provide a very easy way to move things around and listen on any computer—no matter whose its.