These are the musical intervals over two octaves:

Within the first octave:

• Perfect unison: The same note (e.g., C to C).
• Minor second: 1 half step (e.g., C to C#).
• Major second: 2 half steps (e.g., C to D).
• Minor third: 3 half steps (e.g., C to Eb).
• Major third: 4 half steps (e.g., C to E).
• Perfect fourth: 5 half steps (e.g., C to F).
• Tritone/Augmented fourth/Diminished fifth: 6 half steps (e.g., C to F#/Gb).
• Perfect fifth: 7 half steps (e.g., C to G).
• Minor sixth: 8 half steps (e.g., C to Ab).
• Major sixth: 9 half steps (e.g., C to A).
• Minor seventh: 10 half steps (e.g., C to Bb).
• Major seventh: 11 half steps (e.g., C to B).
• Perfect octave: 12 half steps (e.g., C to C’).

Second octave:

• Minor ninth: 13 half steps (e.g., C to C#’ an octave higher).
• Major ninth: 14 half steps (e.g., C to D an octave higher).
• Minor tenth: 15 half steps (e.g., C to Eb an octave higher).
• Major tenth: 16 half steps (e.g., C to E an octave higher).
• Perfect eleventh: 17 half steps (e.g., C to F an octave higher).
• Augmented eleventh/Diminished twelfth: 18 half steps (e.g., C to F#/Gb an octave higher).
• Perfect twelfth: 19 half steps (e.g., C to G an octave higher).
• Minor thirteenth: 20 half steps (e.g., C to Ab an octave higher).
• Major thirteenth: 21 half steps (e.g., C to A an octave higher).
• Minor fourteenth: 22 half steps (e.g., C to Bb an octave higher).
• Major fourteenth: 23 half steps (e.g., C to B an octave higher).
• Double octave: 24 half steps (e.g., C to C” two octaves higher).

Additional notes:

1. Intervals can be perfect, minor, major, diminished, or augmented.
2. Perfect intervals: Unison, fourth, fifth, octave (and their compound forms like eleventh, twelfth, etc.)
3. Diminished intervals: are smaller than perfect or minor intervals.
4. Augmented intervals: are larger than perfect or major intervals.
5. Intervals larger than an octave are called compound intervals (e.g., ninth, tenth, eleventh).