Sony Ericsson is compiling The Walkman phones 100, the world’s favorite songs of all time, to coincide with the launch of its new family of Walkman phones. The Sony Ericsson Walkman phone W800 and gives 30 hours of battery life in music mode or 15 hours of battery life if the phone is also being used to receive calls. Complete with a two megapixel, auto-focus camera with picture light and digital still camera interface, the Walkman phone weighs less than a 100 grams.