2008 NWZ-S639F
The NWZ-S639F is the largest capacity model with FM functionality part of the 6th generation S series.
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The NWZ-E575 served as the higher-capacity 16 GB variant in the 2012 E Series. It supports MP3, WMA, AAC, and WAV files through the same 240x320 TFT display and 50-hour lithium-ion battery as its 8 GB siblings. FM radio, WM-PORT, video and photo playback, DSEE, Omakase Channel, and Lyric Pita completed the feature set.
The E575 gives that same late E platform its fullest version and probably the cleanest expression of Sony's "late modest Walkman done right" formula. It still is part of the same low-friction, low-maintenance philosophy as the surrounding models, but here it feels a little more complete and a little less constrained.