MP3 player

I'm looking to play an MP3 stored in memory on my Arduino.

Thinking of ysing the sparkfun MP3 shield.
https://learn.sparkfun.com/tutorials/mp3-player-shield-hookup-guide-v15

I can't figure out if this is possible or if it can only play MP3s from the SD card. Is this the right Sheila for doing this?

There's not enough memory on the Arduino to hold much of an MP3. You're going to have to use the SD card.