DEEP PURPLE's classic Machine Head album will be the subject of a 50-minute documentary in the third Classic Albums TV series, which is now being prepared, according to the DEEP PURPLE Appreciation Society. Previous shows in the series have provided excellent insight into the albums in question, interviewing the musicians and the producer, and telling the story behind the album. The DPAS reports that Ritchie Blackmore, Ian Gillan, Roger Glover, Ian Paice and Jon Lord have all agreed to take part and interviews will be filmed shortly. Contemporary footage is scarce and as the main emphasis is on the album, film clips are likely to be short. Cuttings and memorabilia will also be featured. The series will go out on the ITV network, and later issued in an extended format on DVD.