A binaural beat is when you hear two tones — one in each ear — that are slightly different in frequency, your brain processes a beat at the difference of the frequencies. These play with the concept of resonance and are also great tools to use in meditation and anxiety reduction.
Solfeggio Frequencies are single tones that have been shown to have great importance in the natural world, and have been shown to be associated with different Chakras and meditation techniques.
Both are great tools that can aid listeners in living a healthier life. Solfeggio Frequencies have a rich history dating back to medieval times, and have re-surfaced in the 1970’s.