here you can learn the easy way to form your chords, for instance what is the interval. involved in forming your your Major,minor,diminished and Augmented chords. Major interval = 4+3, that is d to m =4, m to s = 3 now we are dealing with key G. Major interval = G + B + D. minor interval = G + Bb + D you reduce the 3rd by a semi-tone. diminished interval = G + Bb + Db you reduce both 3rd and 5th by a semi-tone. Augmented interval = G + B + d# you increase the 5th degree by a semi-tone. Now what is a semi-tone a semi-tone is the shortest distance for instance G to G# or Gb. while a tone is the longest distance for instance G to A or F.