Mark Aitken examines the relationship between photography and sound. This week: Yiannis Katsaris's series about ‘Moochie the Clown’ is turbulent with unexpected twists, tragedies and celebrations, haunting memories and over-grown ambitions. We’ll be questioning the divide between public and private and what right (if any) we have to delve into the life of an extrovert hiding behind a mask. Past editions of the show are here.