TL;DR: 24-EDO at a Glance

• Notation: Commonly uses half-sharps (‡) and half-flats (d) to denote quarter-tone shifts.

Chromatic Scale

All 24 notes (quarter-tones):

• C - C^‡ - C^# - D^d - D - D^‡ - D^# - E^d - E - F^d - F - F^‡ - F^# - G^d - G - G^‡ - G^# - A^d - A - A^‡ - A^# - B^d - B - B^‡

Intervals

The distance between two notes:

• P1 Unisson 0 ¼ tone
• art2 Arto 2nd 1 ¼ tone
• m2 Minor Second 2 ¼ tones
• n2 Neutral Second 3 ¼ tones
• M2 Major Second 4 ¼ tones
• art3 Arto Third 5 ¼ tones
• m3 Minor Third 6 ¼ tones
• n3 Neutral Third 7 ¼ tones
• M3 Major Third 8 ¼ tones
• sub4 Tendo Third / Sub Fourth 9 ¼ tones
• P4 Perfect Fourth 10 ¼ tones
• ov4 Over Fourth 11 ¼ tones
• TT Tritone 12 ¼ tones
• un5 Under Fifth 13 ¼ tones
• P5 Perfect Fifth 14 ¼ tones
• art6 Over Fifth / Arto Sixth 15 ¼ tones
• m6 Minor Sixth 16 ¼ tones
• n6 Neutral Sixth 17 ¼ tones
• M6 Major Sixth 18 ¼ tones
• art7 Tendo Sixth / Arto Seventh 19 ¼ tones
• m7 Minor Seventh 20 ¼ tones
• n7 Neutral Seventh 21 ¼ tones
• M7 Major Seventh 22 ¼ tones
• ten7 Tendo Seventh 23 ¼ tones
• P8 Perfect Octave 24 ¼ tones