Roman Numeral Analysis frees music from fixed keys

Jay McNeill critiques the reliance on lettered chord progressions like C-C-F-G, which trap performers in specific keys (Jay McNeill from Music Theory for Everyone). He advocates for Roman Numeral Analysis, where musicians identify chords by their position relative to the tonic, such as the I-I-IV-V progression. This method enables composers to transpose ideas across any scale, such as moving from C Major to B Major, to maintain the same harmonic relationship regardless of the starting note.

Functional harmony organizes chords by their role as Tonic, Pre-Dominant, or Dominant, providing a framework for melody to tell a story (Jay McNeill from Music Theory for Everyone). For example, a composer might substitute a ii chord for a IV chord to serve as a Pre-Dominant, or use a B♭7 chord to create dominance through a tri-tone interval. This approach allows musicians to manipulate tension and resolution to convey complex emotions beyond simple major or minor labels.

The process of building these structures requires a deep understanding of the craft, as seen in the work of those who handcraft their own models and processes (Trading Research Hub). Musicians who analyze progressions through these criteria—identifying keys, harmonic functions, and the evolution of tension—develop a greater capacity to expand their palette of musical combinations. This systematic investigation of notes and chords defines the trajectory of a composition.