Free AI chord finder and song transcriber. Extract chords, tempo, and key signatures from MP3, WAV and FLAC files with our online chord recognition tool.
Most basic chord detectors rely on rudimentary pitch-class profiling, leading to frequent errors on complex musical arrangements. Full Partituras Studio Chord AI employs a robust digital signal processing pipeline built on Librosa: Harmonic-Percussive Source Separation (HPSS) isolates harmonic tonal content from transient drum noise, Constant-Q chroma features are extracted from the harmonic stream, and pitch distributions are matched against harmonic chord templates.
Viterbi HMM Smoothing: Raw frame-by-frame chord estimates are regularized using a log-space Viterbi-based Hidden Markov Model. This ensures musically plausible transitions and eliminates erratic fractional-second chord fluttering.
From Your Audio Files: Upload local MP3, WAV, or FLAC audio files—the engine decodes, analyzes, and synchronizes the chord progression timeline automatically.
Neural Network Roadmap: A CRNN (Convolutional Recurrent Neural Network) architecture is in development to provide an additional neural recognition mode alongside the current DSP baseline, deployable via ONNX Runtime.