When I was at the University of York I had a show on University Radio York (aka URY). (This fact has earned me some cool points with my children.) I had two hours on a Saturday morning to fill. I found it quite hard to fill the show. If you wonder why, then try and think what it must be like to find 30 tracks you like, when you're only 20, and in the days before the Internet. One of the tricks I'd do was to find an album with a song I knew on it, play that song, and pick another half decent track on the same album - only one album to lug around then.