Oh wow, didn't realise how much the APRA thing is a little sore point here. Sorry peeps.
For those still listening, here is my take on this one.
First off, I am not a Performing Rights lawyer and will never be qualified as one. I just have to deal with this stuff on a regular basis, that's all.
What I know, professionally and personally is that APRA was set up to protect and pay artists. The ones who spend years making the art, the songs we listen to every day. It was not set up to keep Madonna rich, it was set up to make sure that the song writer that made your coffee this morning got a few cents every time their song was played. That in essence is why APRA exists.
From what I have read there are two distinct situations.
Situation #1 - Playing music, a publicly broadcasted radio station, internet radio, your own playlist, at work in a closed environment that is not readily accessible to the general public. This is not part of APRA's charter and you do not pay any royalties on this. So relax and play music to your hearts content
Situation #2 - You play music in a public domain. This means that no matter what your business, you play music that the general public is exposed to. You need to pay for the right to do this.
This is what APRA is big on, music played in a public domain.