Amarok is a popular audio player under Linux. It can manage external storage devices, transfer music to your iPod, display lyrics, and play various formats. Although Amarok supports scripts to extend its functionality, not many users know about the powerful features that these simple plugins can provide.
With Audio Format Converter, you can convert audio file formats between FLAC, Ogg, MP3, MPC, M4A, and WAV. Launch this Python script from Tools -> Scripts Manager with the Run button. It will ask you where you want to save the resulting files, what naming convention you want to use for them (track number plus title, subfolders with artist's name, album and the file as a song title, or just a simple file with all three as the basename). Finally, depending on the audio converting tools already installed in your system, Audio Format Converter lets you choose an output file format and quality setting. It performs the conversion in the background, with only a popup message announcing the beginning of each process; in the meantime you can listen to your favorite songs.