- Artusi - A huge set of free online courses on ear training (melodic, harmonic, rhythmic dictation), four part-writing and counterpoint where you type notes directly in the browser. (Does it make Counterpointer obsolete?)
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Miranda Wilson. Integrated Musicianship: Aural Skills - An open-source, interactive, online textbook for college-level music courses
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SoundGym - Ear training for mixing engineers: EQ, compression, stereo image, gain, reverb
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ToneGym - Intervals, chords, rhythms (with some gamification)
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Perfect Pitch - Intervals, chords, scales, inversions
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Сольфа - Музыкальные диктанты. Советую также попробовать MacGAMUT Dictation на Artusi
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https://mtosmt.org/issues/mto.21.27.2/mto.21.27.2.chenette.html
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Gary S. Karpinski - a university teacher who, for decades, follows the cognitive studies on aural skills development and implements them in his teaching practice
- a study book: Manual for Ear Training and Sight Singing and Anthology for Sight Singing
- a podcast
- a methodology (2000): Aural Skills Acquisition: The Development of Listening, Reading, and Performing Skills in College-level Musicians
- papers
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Matrix singing by Dr. Blaise Ferrandino