According to a research performed at Duke University, an individual's'individual's sense of harmony stems from speech. Schwartz, Catherine Howe, and Dale Purves analyzed conversations from about 500 different English-speaking people. They divided the speech into a sound spectrum (a graph of tones we use in our daily lives when we talk). The results the researchers found were that our favourite harmonies are combinations of our most used tones; that is when the tones of the sound spectrum graph are close together, harmony results. This study was performed because of the ‘feeling’ that there was some relation to music which is, harmonies that sound best to us are the ones we hear in conversations.