Exaile: Music Player for GTK+ designed after the classic Amarok 1.4 interface.
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Pro A lot of built-in plugins
Exaile comes pre-loaded with a lot of plugins so users can customize the application how they see fit.
Pro Can handle large libraries
Exaile utilizes a SQLite database to store information. As such, it can handle large music libraries.
Pro Trimmed down interface
Exaile excels for being a simple-to-use music player that is not filled with a lot of guff.
Exaile has a built-in equalizer.