Hi,
I read your project requirements. What you need is a Arduino based system that can MP3 music. I can help you with this.
I have done several electronic projects in the past. Some of them are Arduino based.
We can use a mp3 shield with micro SD card slot for this project. If you prefer a low cost solution, we can use ".wav" file instead of ".mp3" so we don't need an additional hardware to play music.
You may contact me for any clarification.
Kind regards,
Akilan