You'll have the same problems with poor variety on most radio stations. For some reason, they seem to think you want to hear the same stuff all the time. It's not like it was, many years ago, when the "DJs" made their own selections. Like you, I've also started listening to MP3. At the moment I'm listing to the collection on my smart phone. At the moment, it's James Galway, in the past few minutes, it's been Art Garfinkle, Carly Simon, Enya and Elton John. These days, if you want variety, you have to make up your own, rather than listen to what the "program directors" decide will be forced on you.
With over 800 songs on my phone, I can go a long time before it becomes repetitive.
With over 800 songs on my phone, I can go a long time before it becomes repetitive.