Read wide intervals by counting both endpoints and then connect the number to a reliable keyboard span.
Counting only the gaps between notes produces an interval number that is one too small. Your goal for this lesson is clear: Can you distinguish a sixth, seventh, and octave from their staff geometry before counting every letter?
Count every letter name
Include the starting and ending notes when naming an interval. C to A is a sixth, C to B is a seventh, and C to the next C is an octave.
Compare each pair in the illustration for “Count every letter name” (C4, A4, C4, B4, C4) before naming its destination. Count staff positions inclusively, classify the distance, and then verify that the keyboard span matches what the notation shows.
Hear stability and tension
Sixths often sound open and consonant, sevenths usually lean toward resolution, and octaves reinforce the same pitch class in a new register.
Sixths, Sevenths, and Octaves at the keyboard
Now take the idea to the keyboard. From C, compare C-A, C-B, and C-C so sixth, seventh, and octave have distinct visual and physical sizes.
- 1Play C-A and say sixth.
- 2Expand to C-B and say seventh.
- 3Expand to C-C and confirm the repeated letter name at the octave.
Sixths, Sevenths, and Octaves check
Counting only the gaps between notes produces an interval number that is one too small.
Can you distinguish a sixth, seventh, and octave from their staff geometry before counting every letter?