Syd Barrett: Guitar, vocals (Astronomy Domine, Lucifer Sam, Matilda Mother, Flaming, The Gnome,

Chapter 24, The Scarecrow, Bike).
Roger Waters: Bass, vocals (Pow R. Toc H, Take Up Thy Stethoscope and Walk), additional guitar.
Richard Wright: Hammond organ, Farfisa Compact Duo organ, piano, voice (Astronomy Domine, Matilda Mother).
Nick Mason: Drums, percussion.
(Like "Nicky Mason" in the credits)


Other musicians 

Norman Smith: Drums, instrumental arrangements.
Peter Jenner: Introductory voice, with megaphone (Astronomy Domine)