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Meludia - Listening exercises and to sharpen your ear and music theory skills
teoría - Ear training and music theory exercises.
GNU Solfege - GNU Solfege is free music education software.
MusicTheory Piano - MusicTheory Piano is the web-based tool that is used to play and practice the tunes and music on the Piano.
Perfect Ear - A simple yet advanced application for improving your solfege skills.
musictheory.net - Music theory exercises.