How to make a button or sensor select an audio file from a memory device?

I would like to know about any instructables (or help in general) on making an arrengement that would make use of a button or motion sensor to select a music or audio file from a memory storage device (like an mp3 or a Compact Disc player) and let me play it on a set of speakers. Anything on that line would be appreciatted including (but not limited to) peripherals that can be bought pre-assembled with this functionality.

I have already checked this instructables, but were to no avail (not what I was looking for):
https://www.instructables.com/id/How-to-Connect-a-Sensor-with-Audio-Input-and-Outpu/
https://www.instructables.com/id/How-to-Connect-a-Push-Button-with-Audio-Input-and-/

This resembles what I am looking for (but I prefer longer lasting ones):
http://www.radioshack.com/graphics/uc/rsk/Support/ProductManuals/2761323A_PM_EN.pdf

Hope you help!
Thanks in advance, Cab

Cabzx (author) 7 years ago
Anything is good sir, single or multitrack (later would be better) but anything on the topic is good.
Do you only want a single track ? Does it need any kind of fidelity ?