Recs.
Updated
Specs
Pros
Pro Great for organizing and editing large collections
Quod Libet gives the user the necessary tools to edit and organize their library from within the app. There is support for tags as well to help you quickly find the music to fit your mood. To help you sort through large libraries, you can use the filters which help filter by genera or other search perimeters.
Pro Easy to use
Despite very good library management capability, Quod Libet is easy to use. The base music player doesn't have too many features, making it a breeze to use. However, if you want to go deeper you can install plugins. These plugins can sometimes add complexity, but it's up to you what you do or don't want.
Cons
Con Plugins could be better integrated
Lyrics are not downloaded automatically in Quod Libet, while simply viewing lyrics could be made a lot more accessible. There is also little information pulled from last.fm - scrubbing works, as well as there being no artist info or suggestions for similar artists.