The cassette Walkman was the first low-cost , portable music player . Final batch was shipped to Japanese retailers in ninth anniversary . first generation Walkman was released on April in Japan . Announcement delivered just April of the Sony 's ninth anniversary .
The cassette Walkman was the first low-cost , portable music player . Final batch was shipped to Japanese retailers in April . First generation Walkman was released on July 1 , 1979 in Japan . Announcement delivered just one day ahead of the iPod 's ninth anniversary .