Why should you use uamp?
Speed and efficiency
Uamp uses minimal system resources while having no problem managing huge amounts of songs.
Simplicity
By simplicity, I don't mean it's simple to use (although the CLI is friendly and well documented). Uamp is simple in principle. The music player should play music. That is what uamp does and does that very well.
Advanced features
Uamp has many advanced features that allow you to enjoy listening to your music. These features include gapless playback, fade play/pause, advanced queue (playlist) management (queue stack), and more.
No bloat
Uamp is a single binary that is about 18 MiB. Once compiled, it doesn't depend on other files except common system libraries.
Documentation
Everything about uamp is well documented at multiple places. The complete basic CLI documentation is the help command. There are also two manual pages: 1 for the CLI and general description, and 5 for describing the documentation.