Rhythmbox is a GTK+ 3 music player that helps organize music collections.
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Pro Internet radio
Rhythmbox has built-in support for users so that they can add their own streaming audio / internet radio channels.
Pro Loads of Features
Rhythmbox allows you to extract CDs to MP3s while listening, and you can also burn CDs from playlists. You can listen to Last.fm and podcasts through Rhythmbox, which has support for lyrics and more.
Pro Plugins add only the features you want
Rhythmbox has built-in support for first and third party plugins. Instead of adding a bunch of features not everyone will use, you can download just the plugins that you want.
Pro Podcast management
Rhythmbox features built-in podcast management.
Pro Good organization
Music can be browsed by the usual artist and album, but Rhythmbox also allows for genres which aren't supported by all music players.
Con No folder browse/add-to-playlist view
So few music players seem to let you browse by your directory structure and add songs to a playlist that way. That's unfortunate because it's a really useful feature and eliminates the problem of mistagged music.
Con Not crossplatform
The only bad part of RhythmBox is that I cannot install it on other OS's.
Con Still no built-in equilizer
Rhythmbox has been around for a good while now and yet there is still no default built-in equalizer. An equalizer allows users to tweak the audio to their preference. It can also help compensate for hardware (for example, lots of headphones are bass heavy, but to get a more balanced sound an equalizer can tune the bass down a touch).
Con No album artist field
Most other modern music players come with an Album Artist Field when sorting music. Collaboration is very common these days and often a song would feature multiple artists, but sometimes it's easier to just sort for Album Artists. It's a rather simple feature, yet Rhythmbox has repeatedly shot down its users for making that request.
Con Buggy and slow when there's a large music collection
Can't cope with a large music collection