Last year, the Walkman turned 40 and cassette sales were the highest for 15 years. How did Sony mark the occasion? With an admittedly rather good Android-flavoured music player, announced in September. Cashing in on a renewed appreciation for the format, the retro twist to the Sony NW-A100TPS arrived in the form of a cassette-inspired interface and a bundled case with original 1979 Walkman...