Which of these intervals is not a major third?

Question

BlackTom AI · Accepted Answer

A major third spans four semitones (two whole tones); a minor third spans three semitones. That semitone count is the key concept for identifying whether a given interval is a major or minor third.

Step-by-step reasoning for E to G:
- Count semitone steps upward from E to G:
  - E to F = 1 semitone
  - F to F# = 2 semitones
  - F# to G = 3 semitones
- Total = 3 semitones, so E to G is a minor third, not a major third.

Show examples of true major thirds (to contrast):
- C to E:
  - C→C# = 1
  - C#→D = 2
  - D→D# = 3
  - D#→E = 4 → major third (4 semitones)
- A to C#:
  - A→A# = 1
  - A#→B = 2
  - B→C = 3
  - C→C# = 4 → major third (4 semitones)
- F to A:
  - F→F# = 1
  - F#→G = 2
  - G→G# = 3
  - G#→A = 4 → major third (4 semitones)

Why the correct answer is correct:
Because E to G contains only three semitones, it fits the definition of a minor third. A major third must contain four semitones, which E–G does not.

Why other choices would be incorrect (briefly):
Any alternative interval that spans four semitones (like C–E, A–C#, or F–A) is a major third, so those cannot be the answer. Only intervals spanning three semitones (minor thirds) would be "not a major third."

Confirming the final answer: E to G is not a major third (it is a minor third), which matches the provided correct answer: E to G.

Which of these intervals is not a major third?单项选择题

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