Renaissance Counterpoint Engine (MVP)

Two-note cantus firmus → generate all legal two-voice realizations in 1st and 2nd species, with counterpoint above or below.

Mode / Final Dorian (on D) Phrygian (on E) Lydian (on F) Mixolydian (on G)

CF entry type

Pitch letters Scale degrees (1–7)

Cantus (2 notes)

Cantus (2 degrees)

Counterpoint position

Above Below

Species 1st species (1:1) 2nd species (2:1) 3rd species (4:1) — coming soon 4th species (syncopation) — coming soon

Optional consonance

Allow perfect unison (P1) as a consonance (lets CP match CF pitch)

Output style Show pitch + octave (recommended) Show pitch letters only

Register window Within a 10th Within a 12th Within a 15th

Max melodic leap Up to a 6th Up to an octave

Generate Clear

Fragment MVP: start/end may be any consonance (3rd/6th/P5/P8, plus optional P1 if enabled). 2nd species allows dissonance on weak beats only as stepwise passing/neighbor.

Consonance set (MVP)

Perfect P5, P8 Imperfect 3rds, 6ths Optional P1 (toggle)

Start/end: any consonance allowed (for this fragment-based MVP).

Voice-leading checks

No parallel 5ths/8ves; avoid direct motion into perfect intervals when CP leaps.

Melodic checks (CP)

No tritone leaps; limit leaps; weak-beat dissonance only as stepwise passing/neighbor (2nd species).

Results

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#	Counterpoint	Vertical intervals	Notes (degrees)

Note: This MVP is intentionally “strict-diatonic.” If you want typical Renaissance cadential leading-tone behavior, we’ll add a musica ficta toggle later.