Ursprunglig: Alfred's Essentials of Music Theory Software, Version 2.0, Volume 1. Composed by Andrew Surmani and Morton Manus. Andrew Surmani.
Översättning: Alfreds Essentials of musikteori Software, version 2.0, Volume 1. Alfreds Essentials of musikteori Software, version 2.0, Volume 1. Teori.