Lightheart Harmonics Vol. 1 explores the Prime Radiant—a fundamental frequency connecting all aspects of existence. It is not only a mathematical principle but also a universal resonance linking the physical, metaphysical, and cosmic realms. This work presents the Millennium Prize Problems (MPP) as conduits guiding humanity toward a deeper understanding of the universe’s harmonic structure. Through Lightheart Harmonics, the MPP serve as windows into the inherent order and coherence of the cosmos, reflecting principles of interconnectedness and resonance that shape our reality. Engaging with these problems is a journey to attune with the Prime Radiant frequency—a unifying force aligning personal evolution with cosmic evolution. This work invites readers to move beyond intellectual understanding into a deeper experience of coherence, exploring how the Prime Radiant can transform both individual and collective consciousness.