The flagship F800 model spearheads the range, featuring Google's latest operating system and FLAC support to reduce file sizes to a fraction of their original capacity.
Sony's F800 Walkman offers full access to the Google Play store, is Bluetooth- and WiFi-ready, and comes with 8GB, 16GB or 32GB of internal storage on board.
The other models are more compact, with lower specs and price points. The S770BT comes with wireless in-ear Bluetooth headphones, and the E570 offers high-quality noise resistance through its built-in tech.
The E470 is available in six different colours and comes with entertainment content preloaded, such as games and a karaoke application.
Available in Europe today (July 19), Sony's new Walkman line is backed by the Sony Music Unlimited platform, but users can drag and drop DRM-free content from third-party services such as iTunes and Windows Media Player.