If a minor interval expands by a semitone, it becomes

Question

BlackTom AI · Accepted Answer

A minor interval increased by one semitone becomes a major interval.

1. Relevant knowledge points and concepts
- Intervals are measured in semitones; their quality (major, minor, perfect, augmented, diminished) depends on pitch distance.
- Major/minor pairs exist for seconds, thirds, sixths, and sevenths: a minor interval is one semitone smaller than its major counterpart.
- Perfect intervals (unison, fourth, fifth, octave) do not have major/minor forms; they become augmented if raised by a semitone or diminished if lowered by a semitone.

2. Step-by-step reasoning
- A minor interval has one fewer semitone than the corresponding major interval.
- Increasing (expanding) a minor interval by one semitone adds that missing semitone, making its size equal to the major interval.

3. Intermediate calculations (examples showing semitone counts)
- Minor 3rd: C to E♭ = 3 semitones. +1 semitone → 4 semitones = C to E = major 3rd.
- Minor 2nd: C to D♭ = 1 semitone. +1 → 2 semitones = C to D = major 2nd.
- Minor 6th: C to A♭ = 8 semitones. +1 → 9 semitones = C to A = major 6th.
- Minor 7th: C to B♭ = 10 semitones. +1 → 11 semitones = C to B = major 7th.

4. Why the correct answer is correct
- By definition, raising a minor interval by one semitone produces the exact semitone count of the corresponding major interval; therefore the interval’s quality changes from minor to major.

5. Why the other options are incorrect
- Perfect: Minor ↔ perfect is not applicable; perfect intervals are a different class and are not obtained by raising a minor interval by a semitone.
- Augmented: Raising a major interval by a semitone produces augmented, not raising a minor interval.
- Diminished: Lowering (contracting) a minor interval by a semitone produces diminished, not expanding it.

6. Conclusion
Therefore, expanding a minor interval by a semitone makes it major. This matches the provided answer: major.

If a minor interval expands by a semitone, it becomes 单项选择题

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