Hi, I have experience with Audio players, and the requirements of your proyect seems to be pretty straight.
I can create all the functionality in 2 or 3 days but, if you accept my offer, we need to discuss about the managment system of the data base and the technology that is available.
The development will include:
DER for the data base
The functionality, in php, to serve the audios
A very basic player so you can play the audios