( ( "the interval name" ) ( "Perf" "4" ) ( "F#B" "2" "6. INTERVAL IDENTIFICATION" "Assume lower note as tonic, number of included letter note-names =size. Fits major scale? 2,3,6,7 =maj; 4,5 =perf. One half-step low from major scale? 2,3,6,7 =min; 4,5 =dim. One half-step high from major scale? 2,3,4,5,6,7 =aug." "54 59" ) )