What are the interval sizes between the two voices below?

Question

BlackTom AI · Accepted Answer

The correct answer is 6, 3, 8 because counting intervals on the staff uses inclusive letter counting (count both the lower and upper notes) and we can read each pair’s relative letter positions.

Relevant concepts:
- Interval size = number of letter names spanned, counted inclusively (unison = 1, second = 2, etc.).
- You read note letter names from the bass up to the treble note (or vice versa) and count every step (line or space) as moving to the next letter name.

Step-by-step for each pair (showing inclusive counts):

1) First pair:
- Identify the lower note as E (the bottom line of the bass staff) and the upper note as C (the C located on the ledger line between staves / lower part of the treble staff).
- Count inclusively: E (1), F (2), G (3), A (4), B (5), C (6).
- Result: spans 6 letter names → a sixth.

2) Second pair:
- Identify the lower note as F (a space in the bass staff) and the upper note as A (a space in the treble staff above middle C).
- Count inclusively: F (1), G (2), A (3).
- Result: spans 3 letter names → a third.

3) Third pair:
- Identify the lower note as G (a line in the bass staff) and the upper note as the G one octave higher (a line in the treble staff).
- Count inclusively: G (1), A (2), B (3), C (4), D (5), E (6), F (7), G (8).
- Result: spans 8 letter names → an octave.

Why the other choices are incorrect:
- 8, 5, 3 would make the first interval an octave (but our first count is a sixth).
- 3, 5, 4 or 5, 4, 3 don’t match the measured counts above for any of the three pairs.

Therefore the measured interval sizes are 6, 3, and 8, confirming the provided answer.

What are the interval sizes between the two voices below? 单项选择题

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