For our reading sequence, we have the lines and spaces of the staff, plus low E. Next, we will work the spaces below. There are only 4 spaces under the staff. Again, we already know low E. And, we also know F from our staff spaces sessions. We are keeping our note-tone groups in sets of 5. This overlap helps us connect the lower to notes on the staff.
What were lines on the staff are spaces below. An octave will always be line to space or space to line. It is an even interval. Odd intervals are line to line or space to space. See Odds/Evens in Deep Reading.
Low G = -3 Space = 6 string, fret 3.
Low B = -2 Space = 5 string, fret 2.
Middle D = -1 Space = 4 string, open.
We already know Low E [-4 Space] & Middle F [Space 1] these - not really below, but we are learning them in groups of 5 and the overlap helps.
Play these tones over and over, in any order, saying aloud the note-head location [line/space and the corresponding number] & the string/fret combination.