The birth, death and astonishing rebirth of the Mellotron is lovingly recounted in this engrossing feature documentary by Dianna Dilworth. Invented by Harry Chamberlin in the late 1940s and pushed briefly to the mainstream in the mid-1960s by a British electronics firm, the neglected stepsister to the Moog Synthesiser is back in vogue, thanks to the devotion of producer-musicians such as Matthew Sweet, Jon Brion and Mitchell Froom, who all appear in the film. In between, we get testimonials from legends like Brian Wilson, Rod Argent, Tony Iommi, Rick Nielson of Cheap Trick, Mike Pinder of the Moody Blues and Patrick Moraz of Yes; newcomers such as Michael Penn and members of groups Big Elf and Maroon 5 also pitch in. Essential viewing for tech-heads, musicans and anyone interested in forgotten corners of pop culture, Mellodrama charts the very beginning of sampling.