What brand is the BMW Z4 audio system?

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BMW uses audio systems from American Bose, Harman Kardon, and Danish BO. Below is an extension about BMW car audio systems: 1. American Bose was founded in 1964 by Dr. Amar G. Bose, a professor at the Massachusetts Institute of Technology. The company has always adhered to the business philosophy of 'pushing the limits of exploration and enjoying the pinnacle of music,' investing 100% of its earnings into corporate development and product research without reservation. 2. Harman Kardon is a division of Harman International Industries (NYSE: HAR), specializing in the production of home and car audio systems, headquartered in Woodbury, New York, USA. JBL, AKG, and Infinity are also brands under the Harman Group. 3. Harman/Kardon was founded in 1953 by Dr. Sidney Harman and Bernard Kardon, both of whom were passionate about music and art. Danish BO is produced in Denmark, the country with the most beautiful audio equipment designs in the world. Denmark is also the country with the most audio brands globally, with approximately one brand for every 250,000 people.