Playmus example is broken

[Starbuck5]

@cassiobotaro put in a PR, #2731, to fix the playmus example being broken in 2.0.1.

The fix they proposed is actually necessary for 2.0.1, but it looks like the underlying issue has been fixed by now in 2.0.2.dev.

But there seem to be no shortage of other things wrong with this example:

Now that I'm looking at this though, there are some other problems. There's a typo - "faid" should be "fade." There also seems to be problems with rewinding and pausing. On 2.0.2.dev2, pausing just closes the window- that shouldn't happen. In 2.0.0, where pausing does work, rewinding doesn't seem to actually work.

It just needs some TLC, some tender loving care.

[rethanon]

@Starbuck5
The issue with the program exiting when the music is paused is due to a change in pygame 2.0.1 which updated pygame.music.mixer.get_busy() to return False when music is paused, in previous versions it returned True (and playmus.py closes when no music is playing).

I should be able to give this a bit of love to get it working properly.