Rhythmbox is a GTK+ 3 music player that helps organize music collections.
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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 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, has support for lyrics and more.
Pro Internet radio
Rhythmbox has built in support for users to add their own streaming audio / internet radio channels.
Pro Podcast management
Rhythmbox features built in podcast management.
Pro Good organization
Music can be browsed by the usual artist and ablum, but Rhythmbox also allows for genres which isn't supported by all music players.
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 preferences, and can 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 is easier to just sort for Album Artists. It's a rather simple feature, yet Rhythmbox has repeatedly shot down it's users for making that request.