Ear training software

 GNU Solfege is an ear training program for X Windows written in Python,
 using the GTK+ 3.0 libraries. You can practice harmonic and
 melodic intervals, chords, scales and rhythms, and you can add new
 exercises using a simple plain text file format.
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 Ear training is a big subject with many connections to music theory
 and performance of music.
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 To use this software, you need some basic knowledge about music theory.