Sony, Sharp, Pioneer, and Kenwood are working together on a new line of stereo systems with Ethernet ports that can download music directly from the Internet without requiring a PC. The joint-venture is called Any Music Planning, and right now the stereos only connect to a Japanse online music service called LabelGate that charges about a $1.90 per track, but there’s probably no reason why these things couldn’t hook up to Apple’s iTunes store or the new Napster 2.0.