Each of the 20 amino acids that make up proteins has a unique vibrational frequency. The chemical structure of entire proteins can consequently be mapped with audible representations, using known concepts from music theory like note volume, melody, chords and rhythm. The specific sounds generated, determined by the way a protein folds, can be used to train deep learning neural networks.
Source: Artificial Intelligence Composes New Proteins – The Building Blocks of Life – as Musical Scores