PaulS:
That does NOT mean that the MP3 shield doesn't also (mis)use other pins. If it uses the I2C pins for ANY reason, that will cause issues when you need to use them for I2C.
The shield does not plug into the arduino any more. I had to rewire it. I am using The ISCP header for miso mosi reset VCC and Ground. The select pins are Digital 8, 10, 11, 12, and 13. 9 is used to control the backlight on the display.
i2c is on 20 and 21
I also pulled all of the pins that were could be causing an issue off of the TFT Shield.
D8 --- Use For SD Card CS
D9 --- Used for TFT Backlight
D10 --- Used for TFT Flash
D11 --- Use for MP3 DREQ
D12 --- Use for MP3 DCS
D13 --- Use for MP3 RESET