It's lucky for you I keep a list handy for just such an occasion... although this version of the list is sadly out of date it will do for now.
1. Blonde On Blonde (Bob Dylan, 1966)
2. Revolver (The Beatles, 1966)
3. Red (King Crimson, 1974)
4. London Calling (The Clash, 1979)
5. Parklife (Blur, 1994)
6. Rubber Soul (The Beatles, 1965)
7. Remain In Light (Talking Heads, 1980)
8. Highway 61 Revisited (Bob Dylan, 1965)
9. Daydream Nation (Sonic Youth, 1988)
10. Fear of a Black Planet (Public Enemy, 1990)
11. The Velvet Underground & Nico (The Velvet Underground, 1967)
12. Powerslave (Iron Maiden, 1984)
13. Paul?s Boutique (The Beastie Boys, 1989)
14. ...And Justice For All (Metallica, 1988)
15. Merriweather Post Pavilion (Animal Collective, 2009)
16. Discovery (Daft Punk, 2001)
17. Ramones (The Ramones, 1976)
18. Selling England By The Pound (Genesis, 1973)
19. Van Halen (Van Halen, 1978)
20. Machine Head (Deep Purple, 1972)
21. Supreme Clientele (Ghostface Killah, 2000)
22. Who?s Next (The Who, 1971)
23. Elephant (The White Stripes, 2003)
24. Dark Side of the Moon (Pink Floyd, 1973)
25. It Takes A Nation of Millions To Hold Us Back (Public Enemy, 1988)
26. Rust In Peace (Megadeth, 1990)
27. Low (David Bowie, 1977)
28. Ride the Lightning (Metallica, 1984)
29. A Christmas Gift For You (Various Artists, 1963)
30. Forever Changes (Love, 1967)
31. Larks? Tongues In Aspic (King Crimson, 1973)
32. The Blueprint (Jay-Z, 2001)
33. Abbey Road (The Beatles, 1969)
34. Endtroducing.... (DJ Shadow, 1996)
35. Sabbath Bloody Sabbath (Black Sabbath, 1973)
36. Sgt Pepper?s Lonely Hearts Club Band (The Beatles, 1967)
37. The Stone Roses (The Stone Roses, 1989)
38. Let It Bleed (The Rolling Stones, 1969)
39. Funeral (Arcade Fire, 2004)
40. Madvillainy (Madvillain, 2004)
41. Pet Sounds (The Beach Boys, 1966)
42. What?s Going On (Marvin Gaye, 1971)
43. Transformer (Lou Reed, 1972)
44. Off the Wall (Michael Jackson, 1979)
45. In the Court of the Crimson King (King Crimson, 1969)
46. Dusty In Memphis (Dusty Springfield, 1969)
47. Holy Diver (Dio, 1983)
48. Parallel Lines (Blondie, 1976)
49. Saturday Night Fever (Various Artists, 1977)
50. Eldorado (Electric Light Orchestra, 1974)