Learn the fundamentals of music theory continuing with tetrachords and major scales. Alfie Magliano (Skrizzly Adams, Niykee Heaton, Sean Kingston) explains what is a tetrachord and the pattern it makes and he demnostrates these on the piano keyboard. Then, Alfie shows you how two tetrachords make a major scale. This is just one of 66 comprehensive music theory video tutorials at Music School Online (MSO) teaching pitch, rhythm, melody, harmony, notation, chords, inversions, scales and so much more that unlock the secrets to communicating with other musicians. Utilize these music theory lessons as a reference guide or an all encompassing education. Learn music theory at your own pace whenever and wherever you want.