Portable Python Projects: Help needed = PIR Music Welcoming Station - Raspberry PI

Title: Portable Python Projects

Hi

I have been on this for a week now and have very little experience with programming and the raspberry Pi. However I have seen that I should be able to set up my RPi with a PIR (I am getting the sensor hub) but have a standalone PIR, which would in turn play music when someone approaches it for a short time and then resets.
(Basically I am doing a Fine art project which will play a MP3 audio as someone approaches my painting and then switches off as they leave)
Can anyone help me please??? I’m desperate!!!
Many thanks in advance for any help you can provide