Who were the two main members of Supertramp?

Answer 1

roger hogsden and rick davies

Original members:

Rick Davies - vocals, keyboards, harmonica;
Roger Hodgson - vocals, electric and acoustic guitars, bass, pianos, keyboards, cello, flageolet;
Richard Palmer (or Palmer-James) - vocals, electric guitar, acoustic guitar, balalaika;
Robert Millar - percussion, harmonica;
Members who joined the band after the departure of Palmer/Millar:

Frank Farrell - harmony vocals, bass, piano, accordion;
Kevin Currie - percussion;
Dave Winthrop - vocals, flutes, saxophones;
Members who joined the band later - the Lineup period:

Dougie Thomson - bass (replaced by Cliff Hugo);
Bob Siebenberg - drums, percussion;
John Helliwell - saxophone, woodwinds, background vocals, occasional keyboards, melodica;
Members who joined the band after the departure of Roger Hodgson:

Mark Hart - vocals, keyboards, guitars;
Cliff Hugo - bass guitar;
Lee Thornburg - background vocals, trombone, trumpet;
Carl Verheyen - guitars;
Tom Walsh - percussion, some drums;
Jesse Siebenberg - background vocals, percussion