mC2 is a rewrite of musikCube .
Playback from library (now playing)
Add/remove now playing songs
Add/fix decoders (files only): MP3, Ogg, FLAC, WAV, WMA (non-DRM?), WavPack?, APE?, MP4/AAC?
Remove decoder libs with conflicting licenses
Tag reading of supported audio types More Info »
Tag & file handling
Write tags (single file)
Move files (path & filename from tags?)
Support for new tags (not in standard TagLib?): disc number, multiple artists, lyrics, etc
Smart/dynamic playlists (auto add & remove tracks from now playing)
Define default queries
User friendly query builder?
Now playing II
Advanced queueing: add album, add to end, add as next, ...
Reorder playlist (also for multiple files at once)
Repeat: track, album, playlist
Output device configuration
Position slider: get/set position in file
Commands & menu structure
Graphics for buttons, sliders, ...
Minimize to tray
Media formats II
Streaming audio decoder (which formats?)
MSN Now playing
Scoring & track selection (IMMS?)