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VocalEasel is a simple lead sheet editor and music rehearsal tool designed for the needs of Jazz vocalists, using LilyPond to produce printable lead sheets and MMA (Musical Midi Accompaniment) to produce MIDI accompaniments.
Tinara is a media production system, currently composed of a basic revision control and archival system (DaMarcus), a build system (Alice), an audio playback engine (Tape), and a graphical audio recording and editing application.
apecomment is an APEv2 music tag editor. It will also support ID3v1/v2 writing. Features other editors do not have are: 1) support encoding detection/conversion, 2) file attachment (cue sheet, jacket image, Lyrics, etc.) support.