Rubato is an AI powered musical therapeutic app that curates personalized playlists based on biometrics and clinical outcomes. Leveraging existing wearables and popular streaming services, Rubato learns which musical attributes create distinct biological responses for each listener. Our technology analyzes cardiac rhythms, trends, and variability as it matches them to musical elements like tempo, key, scale, and structure. Then using AI and Machine Learning, Rubato creates custom playlists for individual needs and emotional states. Our SaaS platform connects wearables and music providers delivering a playlist that optimizes biomarkers in a measurable manner. As importantly, it delivers a user experience that is entirely pleasant and does not require any training or dedicated time. For many years, people have been listening to music for their enjoyment. Now, and certainly in the future, people will use music as a form of Biofeedback, and curate playlists that would scientifically help them to optimize their health and overall well-being. Rubato aims to help them reach this goal.