SimpleSong is a very minimalistic and free audio player. The developer of this app created it because he had a lot of music on his computer and didn't want or didn't have the time to manage the long libraries that iTunes creates.
Honestly, SimpleSong doesn't have many features and the developer stated that more than one time he wanted to play a song with Quick Look to avoid running iTunes and that this didn't work because when you switched from an app other than Finder, Quick Look would close. This behavior has been changed in Mac OS X Lion and you can now play any song with Quick Look and it won't close when you switch apps. And to be honest, Quick Look does a good enough show of playing audio files that you really don't need this app.
Pros
- It is free
- It works well
Cons
- The search feature sometimes doesn't find the song that you want to play
- Not enough controls
- Too minimalistic