The Record Producers profiles a man often labelled "The Fifth Beatle" - Sir George Martin. Richard Allinson and Steve Levine examine his work as a producer, arranger and, through his experiments with sound, technical innovator. Highlights include the first chance to hear newly restored versions of the original master tapes for Please Please Me, along with analysis of the original multi-track of Come Together. This programme also gives Radio 2 listeners the opportunity to hear some of the Beatles most famous songs in a new way. Because of the limitations of tape machines during the 1960s, it was necessary to either record or mix various instruments and voices onto the same track. Once they'd been committed to tape there was no way of separating them. But now, through the use of revolutionary software, listeners can hear some of these parts in isolation for the very first time. In his exclusive interview, Sir George talks about various aspects of the studio and recording process, the albums Sgt Pepper and Abbey Road, along with a number of songs, including Strawberry Fields Forever, Tomorrow Never Knows and Rain.