This test deliberately rewards restraint. A platform does not earn a high fidelity score simply because it generates a polished alternative. The question is whether it helps the songwriter move the existing composition forward without taking authorship decisions away from the songwriter.
1 · MelodyMelody retention
Preservation of the primary vocal melody, melodic contour, important intervals, verse/chorus melody and recognizable hook.
2 · HarmonyChord retention
Preservation of chord progression, harmonic rhythm, key center, major/minor character and important tension-and-resolution movement.
3 · DeliveryCadence & phrasing
Syllable placement, rhythmic phrasing, pauses, pickups, syncopation, emphasis, sustained notes and phrase length.
4 · FormStructural fidelity
Preservation of intro, verse lengths, chorus, bridge, breaks, drops, outro, section order and approximate proportions.
5 · WordsLyric fidelity
Skipped words, substitutions, invented lines, unwanted repeats, pronunciation changes and changes that alter intended delivery.
6 · ProductionImprove the sound, not the song
Can instrumentation, sound design, vocal timbre or production quality improve while melody, chords, cadence, lyrics and core structure remain intact?
7 · InterventionUnwanted reinterpretation
How far does the platform move away from the supplied composition when it was asked to preserve it?
8 · RepairCorrectability
Can one bad element be fixed without losing everything that already worked?
9 · AttemptsRegeneration efficiency
Number of attempts to the first acceptable result and first highly faithful result.
10 · ValuePractical credit cost
Credits and creator effort required to obtain one result that actually satisfies the job—not merely cost per generation.
11 · AgencyCreator-control boundary
Where the creator controls composition, arrangement, delivery, voice identity, production and repair—and where the AI begins making unwanted decisions.
12 · VoiceVoice change without composition loss
Can vocal identity change while melody, timing, cadence, lyrics and emotional dynamics remain intact?
13 · SalvageStem & repair workflow
Can incorrect vocals or instrumental elements be isolated, repaired and rebuilt while preserving the good parts?
14 · HandoffExternal production readiness
Usable exports, stem usefulness, timing/alignment stability and the ability to continue normally in a DAW.