Jeremy Marre explains the social and cultural importance of musical expression to viewers in this video. Includes: 1. Sources & Sorcery - musical diversity from a Balinese exorcism to Inuit throat songs, 2. Songs & Symbols - music among animals such as singing monkeys, plus how animal sounds have influenced human music, and 3. Legends & Labels- social transformation through music, including flameco dancing, samba and punk rock.