A little mainstreamy in parts (Nickelback?), but you know what they say about variety...

http://blog.rhapsody.com/2009/12/toptracksofthedecade.html#more

1. White Stripes, "Seven Nation Army"
2. Outkast, "B.O.B."
3. M.I.A., "Paper Planes"
4. Gnarls Barkley, "Crazy"
5. Missy Elliott, "Get Ur Freak On"
6. Beyonce, "Crazy in Love"
7. Modest Mouse, "Float On"
8. R Kelly, "Ignition (Remix)"
9. LCD Soundsystem, "All My Friends"
10. The Shins, "New Slang"
11. Kanye West, "Jesus Walks"
12. Amy Winehouse, "Rehab"
13. Green Day, "American Idiot"
14. Jay-Z, "Izzo (H.O.V.A.)"
15. Kelly Clarkson, "Since U Been Gone"
16. Yeah Yeah Yeahs, "Maps"
17. Coldplay, "Fix You"
18. Justin Timberlake, "Cry Me a River"Justin
19. Britney Spears, "Toxic"
20. Franz Ferdinand, "Take Me Out"
21. Peter, Bjorn and John, "Young Folks"
22. T.I., "What You Know"
23. Feist, "1234"
24. Gorillaz, "Feel Good Inc."
25. Kylie Minogue, "Can't Get You Out of My Head"
26. System of a Down, "Chop Suey!"
27. Kelis, "Milkshake"
28. Daft Punk, "One More Time"
29. Lupe Fiasco, "Superstar"
30. Rihanna, "Umbrella"
31. Eminem, "The Real Slim Shady"
32. MGMT, "Kids"
33. Lady GaGa, "Poker Face"
34. Big & Rich, "Save a Horse (Ride a Cowboy)"
35. Radiohead, "Idioteque"
36. Usher, "Yeah"
37. The Killers, "All These Things That I've Done"
38. Johnny Cash, "Hurt"
39. Animal Collective, "My Girls"
40. Scissor Sisters, "Take Your Mama"
41. Spoon, "The Way We Get By"
42. Norah Jones, "Don't Know Why"
43. Alicia Keys, "Fallin'"
44. Lil Wayne, "A Milli"
45. Amerie, "1 Thing"
46. Jimmy Eat World, "The Middle"
47. Snoop Dogg, "Drop It Like It's Hot"
48. TV on the Radio, "Staring at the Sun"
49. Merle Haggard, "Wishing All These Old Things Were"
50. The Strokes, "Last Night"
51. The Postal Service, "Such Great Heights"
52. Madonna, "Music"
53. Muse, "Knights of Cydonia"
54. José González, "Heartbeats"
55. Nickelback, "Photograph"
56. The Fray, "How to Save a Life"
57. Soggy Bottom Boys, "I Am a Man of Constant Sorrow"
58. Snow Patrol, "Chasing Cars"
59. Nas, "Made You Look"
60. Vampire Weekend, "A-Punk"
61. Queens of the Stone Age, "No One Knows"
62. Lily Allen, "Smile"
63. Lil Jon & the East Side Boyz, "Get Low"
64. Justice, "D.A.N.C.E"
65. Clipse, "Grindin'"
66. Panjabi MC feat. Jay-Z, "Beware of the Boys (Mundian To Bach Ke)"
67. Dropkick Murphys, "I'm Shipping Up to Boston"
68. Death Cab for Cutie, "I Will Follow You into the Dark"
69. Gwen Stefani, "Hollaback Girl"
70. Daddy Yankee, "Gasolina"
71. Fallout Boy, "Thnks Fr Th Mmrs"
72. Christina Aguilera, "Beautiful"
73. Switchfoot, "Dare You to Move"
74. 50 Cent, "In Da Club"
75. Three 6 Mafia, "Stay Fly"
76. Kid Rock, "All Summer Long"
77. Carrie Underwood, "Before He Cheats"
78. Basement Jaxx, "Where's Your Head At"
79. Damien Marley, "Welcome to Jamrock"
80. Miranda Lambert, "Kerosene"
81. Mike Jones, "Still Tippin'"
82. The Swell Season, "Falling Slowly"
83. Taylor Swift, "Love Story"
84. Talib Kweli, "Get By"
85. James Blunt, "You're Beautiful"
86. Flaming Lips, "Do You Realize??"
87. Band of Horses, "Funeral"
88. Sara Bareilles, "Love Song"
89. Lil Mama, "Lip Gloss"
90. D’Angelo, "Untitled (How Does It Feel)"
91. The Raconteurs, "Steady as She Goes"
92. Toby Keith, "Courtesy of the Red, White and Blue (The Angry American)"
93. U2, "Beautiful Day"
94. Pink, "Don't Let Me Get Me"
95. Linkin Park, "Numb"
96. The Rapture, "House of Jealous Lovers"
97. Shakira, "Hips Don't Lie"
98. Black Eyed Peas, "Boom Boom Pow"
99. The Streets, "Fit but You Know It"
100. Estelle, "American Boy"

is this eligible?

My answer is the same as for Myspace.com.

a music-only site? (or at least that's the core of its site) On the homepage, it says "music, downloads, music videos, lyrics and photos."

MySpace is a social networking site, with music, movie promotions, and that kind of stuff.