Some call this the iPod nano killer - jury is still out for me. Either way this is a fairly simple, no-frills mp3 player with a radio.

I think this is the perfect easy-style easy2use mp3-player? could it be more simple??? (let me know ;-) )

I think this is the closest to what you're looking for your parents. MP3, radio, and uses regular batteries. I think the LCD screen is a bit small for elders though, like my parents always have to ask me what's on their cell phone screen! You may want to google this up too: Truly Pic 'N Roll FC-606 (bigger LCD screen)