Major Interval: A major interval is wider than a minor interval and often conveys a brighter or happier sound. It is commonly found in major scales and chords.
Minor Interval: A minor interval is narrower than a major interval and often conveys a sadder or darker sound. It is commonly found in minor scales and chords.
Perfect Interval: A perfect interval has a stable and consonant sound. It can be either major or minor but retains its "perfect" quality due to its inherent stability. Examples include the perfect fifth (C-G) or the perfect octave (C-C).