Okay, I'm teasing you with non-existent technology again, but we were just thinking how cool it would be to combine the relatively new technology of chargeable USB built-in batteries (as opposed to AA batteries. How disappointing it is these days to scroll through a product spec and see AA or AAA) with an old style cassette walkman. Many of us have stacks of old tapes, and apparently, they're back in vogue with 'the youth'. With all the record player-to-mp3 hardware out there, has no one made this yet???