In The Liners

Every song arrives with a story.

A pass is one song
Handed to one person, with a note saying why. Not posted. Not broadcast. Handed over.
You get three passes
Each one comes back seven days after you spend it. You cannot earn more, and there is no Monday when they all return. Spending one on somebody is the whole point.
The note is required
If you cannot say why, it is not ready to send. That sentence is the thing people keep.

You need an invitation, and the only way to get one is for someone to spend a pass on you.