Nightingale is a free and open-source desktop audio player and web-browser, it is fork of the Songbird media player. It has beautiful interface with a wide range of supported audio formats including flac, all with multi-platform support (Linux, Windows, and Mac). It supports extensions and skins feathers. Like Firefox/Iceweasel, it is built from the Mozilla cross-platform and open source framework, based on Songbird. Users can add features and change functionality in Nightingale by installing extensions (add-ons).
Skins are referred to as "feathers" in Nightingale, and give users and artists the ability to change the look of Nightingale via an extension which generates a default skin. Using CSS (and optionally XUL), and an image manipulation program such as Photoshop or GIMP, users are then able to make Nightingale look however they want.

Main Features:
  • Plugins compatible with Songbird (with one modification to the addon)
  • Multi-platform compatibility with Windows XP, Vista, 7, Linux and Mac OS X
  • Ability to play multiple audio formats, such as MP3, AAC, Ogg Vorbis, FLAC, Apple Lossless and WMA
  • Media files stored on pages viewed in the browser show up as playable files in Nightingale
  • MP3 file download
  • Ability to subscribe to MP3 blogs as playlists
  • Ability to build custom mixes
  • Ability to scan the user's computer for all audio files and add them to a local library
  • A configurable and collapsible graphical user interface similar to iTunes, and mini-player mode
  • Keyboard shortcuts and media keyboard support
  • Last.fm integration via a plugin, complete with love/hate buttons
  • Microsoft MTP compatible device support
  • Ability to edit and save metadata tags
  • Gapless playback and ReplayGain
  • Watch folders

Screenshots
nightingale

Release notes of this version:
  • Improved localization in every locales
  • Splash screen updated
  • "songbird" protocol is replaced by "ngale"
  • Remove newsletter from firstrun dialog
  • Play count increment fixed
  • Remove duplicate preferences menu entry on Linux
  • Allow add-ons to have localized display panes titles
  • Update add-ons locales (mashTape, Last.fm, SHOUTcast)
  • Disable metrics everywhere
  • Removed misleading warning in Watch Folder settings
  • Fixed a last.fm extension issue
  • Fixed importing wma files on Linux
  • Added a firstrun and upgrade page
  • Migrate to new update host
  • Fix updating on Linux
  • Fix mashTape video tab

>> Available for Ubuntu 14.04 Trusty/13.10 Saucy/13.04 Raring/12.10 Quantal/12.04 Precise/Linux Mint 17/16/15/14/13/other Ubuntu derivatives
To install Nightingale Audio Player in Ubuntu/Linux Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:
That's it
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