I don't know of any mp3 players that do this. However, if you have an ipod touch or iphone; on itunes, there are APPs that allow a person to change the tempo of songs. One I know is called Tempo Magic. There used to be a free version called Tempo Lite. I don't think they have that anymore. the full version was around $4.99. I'm sure there are other APPs out there if you check itunes or even the Android market place.
But yes, you'd at least need an ipod touch, iphone, Android device or one of the other smart phones to download the APPs to change your music.
Edited by: ARCHIMEDESII at: 10/19/2012 (16:47)