Ralf Hütter (born 20 August 1946 in Krefeld, Germany) is the lead singer, keyboardist, and reportedly "band leader" of Kraftwerk and is usually the one interviewed. His deep, noticeably accented tenor voice helped to set Kraftwerk apart from other musical groups.
from a book review - Kraftwerk: Man, Machine and Music - on amazon.com:
Pascal Bussy brilliantly probes and lauds the rigid and creative worldview of Kraftwerk's brain, namely, Ralf Hutter. He is extremely aloof while also being a source of goodwill. Bussy unveils that the dynamic Ralf Hutter is an environmentalist, vegetarian and indomitable biker.
Interview from Dummy No.1 - Spring 2006 referring to Hütter's cycling:,
Then there's diet. I'm a vegetarian and try to consume a lot of fresh food in order to do the long distances.