It should work with everything powered and recharging from the MP3 player, but it could tax the MP3 players power supply. Try it and see how it works.
If you want all the components to recharge faster or if you are concerned about overloading the power supply in your MP3 player, you could use an inexpensive externally powered USB hub to recharge/power just you add-on components. The MP3 player would still run and recharge from it's own power supply, but the speakers would run and recharge on the hub's power. I've had to do that with an older computer that had a small power supply and a power hungry TV video card. Externally powered hubs only cost $10 to $20.
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