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During the last years speech dialog systems have proven valuable for controlling infotainment systems in cars. The increasing popularity of mobile MP3 players and their capability to store more and more MP3, suggest the development of a speech control function for car MP3 players. With technical advantages in hardware and speech recognition it is possible to focus on the development of an intuitive speech dialog, which ensures that the advantages of speech control can be utilized while disadvantages are minimal at the same time. This paper describes the user-centered development of such an intuitive dialog, its special challenges and the reached quality in usability and ease of use. Also the generalizability of the results is discussed.