I've been enjoying listening to Internet streaming radio from Germany. The "Schlager" stations seem to play only German-language adult contemporary music. Sort-of "safe for work" music. Not normally my cup of Tee but I find that the vocals are generally very clear and well enunciated. After each Fluenz lesson, I find that I can understand more of the content. The music very tame and is easy to tune out. Virtually no spoken material. Easy to have on in the background while working or otherwise tasked.
For a list of stations try
http://www.listenlive.eu/germany.html. If you have an iPhone, iPad, or iPod Touch check out the app TuneIn Radio (this is what I use.)