What happens when the senses blur and we can see and hear simultaneously? This phenomenon is called synesthesia. Life-long musicians, Kristi Deprin, talk about synesthesia while exploring the key of G. They also play "Guess the Pitch" and explain why some pitches, or notes, sound higher and why some sound lower and how we can group those pitches together to form a family or key. Then, episode ties all the concepts together by paying tribute to singer/song writer Billy Joel with a cover of "Goodnight, My Angel." As the song states, "Someday we'll all be gone, but lullabies live on an on."