Profile: Ralf Hütter, Kraftwerk
23 April 2012 Last updated at 15:44 BST
Ralf Hütter is the sole founder member still playing with the German band Kraftwerk.
The electronic music pioneers have just completed a major series of concerts in New York and are promising that they will soon be releasing a new album - the first in nearly a decade.
Coming from an obscure industrial background, Kraftwerk first formed in 1970, and are now credited with being hugely influential on a host of musicians and on music of diverse types, including electronic, hip hop, house and drum and bass.
Notoriously uncommunicative with the outside world, Kraftwerk used to only have a fax machine as a point of contact at their studio. Chris Bowlby charts the life and legacy of Ralf Hütter for Radio 4's Profile.