All 4 contribute to the Floyd sound no doubt, but RW had a lot of importance in the albums, because he composed most of the songs.
who sings :
THE DARK SIDE OF THE MOON (1973)
1. Speak to Me - NONE (Instrumental)
2. Breathe (In the Air) - Dave Gilmour
3. On The Run - NONE (Instrumental)
4. Time - Dave Gilmour & Rick Wright
4b. Breathe Reprise - Dave Gilmour
5. The Great Gig in the Sky - Clare Torry
6. Money - Dave Gilmour
7. Us and Them - Roger Waters, Dave Gilmour & Rick Wright
8. Any Colour You Like - NONE (Instrumental)
9. Brain Damage - Roger Waters
10. Eclipse - Roger Waters
WISH YOU WERE HERE (1975)
1. Shine On You Crazy Diamond (Pts. 1-5) - Roger Waters
2. Welcome to the Machine - Roger Waters & Dave Gilmour
3. Have a Cigar - Roy Harper
4. Wish You Were Here - Dave Gilmour
5. Shine On You Crazy Diamond (Pts. 6-9) - Roger Waters
ANIMALS (1977)
1. Pigs on the Wing (Pt. 1) - Roger Waters
2. Dogs - Dave Gilmour & Roger Waters
3. Pigs (Three Different Ones) - Roger Waters
4. Sheep - Roger Waters
5. Pigs on the Wing (Pt. 2) - Roger Waters
THE WALL (1979)
1. In The Flesh? - Roger Waters
2. The Thin Ice - Dave Gilmour & Roger Waters
3. Another Brick in the Wall (Pt. 1) - Roger Waters
4. The Happiest Days of Our Lives - Roger Waters
5. Another Brick in the Wall (Pt. 2) - Roger Waters, Dave Gilmour, & kids from Islington Green School, London
6. Mother - Roger Waters & Dave Gilmour
7. Goodbye Blue Sky - Dave Gilmour & Roger Waters
8. Empty Spaces - Roger Waters
9. Young Lust - Dave Gilmour
10. One of My Turns - Roger Waters
11. Don't Leave Me Now - Roger Waters
12. Another Brick in the Wall (Pt. 3) - Roger Waters
13. Goodbye Cruel World - Roger Waters
14. Hey You - Dave Gilmour & Roger Waters
15. Is There Anybody Out There? - Roger Waters
16. Nobody Home - Roger Waters
17. Vera - Roger Waters
18. Bring the Boys Back Home - Roger Waters
19. Comfortably Numb - Roger Waters & Dave Gilmour
20. The Show Must Go On - Dave Gilmour
21. In The Flesh - Roger Waters
22. Run Like Hell - Roger Waters & Dave Gilmour
23. Waiting For The Worms - Dave Gilmour & Roger Waters
24. Stop - Roger Waters
25. The Trial - Roger Waters
26. Outside the Wall - Roger Waters
THE FINAL CUT (1983)
1. The Post-War Dream - Roger Waters
2. Your Possible Pasts - Roger Waters
3. One of the Few - Roger Waters
4. The Hero's Return - Roger Waters
5. The Gunner's Dream - Roger Waters
6. Paranoid Eyes - Roger Waters
7. Get Your Filthy Hands Off My Desert - Roger Waters
8. The Fletcher Memorial Home - Roger Waters
9. Southampton Dock - Roger Waters
10. The Final Cut - Roger Waters
11. Not Now John - Dave Gilmour & Roger Waters
12. Two Suns in the Sunset - Roger Waters