Method for extracting individual instrumental parts from an audio recording and optionally outputting sheet music

A computer based method for extracting individual instrumental parts from an audio recording, said method comprising the steps of:

• a. providing an audio recording;
• b. selecting a sample rate;
• c. calculating through a computer a cross-spectral density between the audio recording and a soft attack sample over a time domain of the soft attack sample at n=1, wherein n=1 representing a first sample of the audio recording;
• d. calculating through a computer an autospectral density of the audio recording over the time domain of the soft attack sample in step (c);
• e. calculating through a computer a coherence between the audio recording and the soft attack sample over the domain of the soft attack sample at n−1 using the calculations from step (c) and step (d) and information for the soft attack sample stored in an electronic database;
• f. recording the calculated value for coherence;
• g. repeating steps (c) through (e) at a beginning of each new sample of the audio recording from n=2 until a (n−x)th sample, where x is a number of samples in the domain of the soft attack sample and n is a total number of samples for the audio recording based on the sample rate selected in step (b);
• h. repeating steps (c) through (g) for medium attack samples and for loud attack samples;
• i. repeating steps (c) through (h) for each note for each instrument selected;
• j. identifying through a computer peaks of coherence values between the attack samples and the audio recording for each note of each instrument;
• and
• k. recording the note, force, instrument and timecode data at which each peak occurs in the electronic database or another electronic database.