6: Post-Tonal Music (I) Last updated Save as PDF Page ID 61978 Robin Wharton and Kris Shaffer eds. Open Music Theory via Hybrid Pedagogy Publishing 6.1: Pitch (class) 6.2: Interval (class) 6.3: Modulo Arithmetic 6.4: Organizing Forces - Collections and Scales 6.5: Organizing Forces - Symmetry and Centricity 6.6: Set Theory - Normal Order 6.7: Set Theory - Transposition 6.8: Set Theory - Inversion 6.9: Set Theory - Set Class and Prime Form (1) 6.10: Set Theory - Set Class and Prime Form (2) 6.11: Set Theory - Complements 6.12: Set Theory - Common Tones under Transposition