Also, due to bias, I bumped papiyon’s, wowaka’s, and hachi’s songs first on the list. :D
And I can’t believe I spent two days trudging through the Vocaran videos (via Youtube. “orz Nico was being AGHH.) all the way from January. :| Plus, I couldn't even decide on 50 songs I liked. TT A TT There were like, 80. "orz

1. Koi Ritsu Houteishiki ( Hatsune Miku ) - papiyon
2. E? Aa, sou. ( Hatsune Miku ) - papiyon
3. Shinpakusuu #0822 ( Hatsune Miku ) - papiyon
4. Specification ( Hatsune Miku ) - papiyon
5. Rolling Girl ( Hatsune Miku ) - wowaka
6. WORLD’S END UMBRELLA ( Hatsune Miku ) - hachi
7. Sajou no Yumekui Shoujo ( Megurine Luka ) - hachi
8. Rinne ( Hatsune Miku ) - hachi
9. Matryoshka ( Hatsune Miku & GUMI ) - hachi
10. Bungaku Shounen no Yuuutsu ( Hatsune Miku ) - HoehoeP
11. Albino ( Hatsune Miku ) - buzzG
12. Aquarium ( Megurine Luka ) - Kihee
13. Tsukiyukihana ( KAITO ) - ebot
14. Child’s Garden ( Megurine Luka ) - otetsu
15. DYE ( Megurine Luka ) - AVTechNO!
16. Taiyou to Tsuki no Rondo ( Hatsune Miku & Megurine Luka ) - Polyphonic Branch
17. Saboten to Shinkirou ( Hatsune Miku ) - JakkanP
18. UNBALANCE ( Kagamine Rin ) - Dios
19. Monochrome ∞ Blue Sky ( Hatsune Miku ) - Noboru↑P
20. sweet vengeance ( Kagamine Rin ) - 150P
21. Electronic・Genocide ( Kagamine Len ) - Neru
22. Yowamushi Mont Blanc ( GUMI ) - DECO*27
23. Melancholic ( Kagamine Rin ) - Junky
24. Holography ( GUMI ) - DevilishP
25. Wanwan-o, Nyannyan-o ( Hatsune Miku ) - NekomushiP
26. Neri no Hoshizora ( Kagamine Rin/Len ) - HanatabaP
27. Itsuwari no Kajitsu 90% ( Hatsune Miku ) - Soda_Lady
28. Just a game ( GUMI ) - takamatt
29. Kimi ni Sasagu Fantasia ( Kagamine Len ) - Polyphonic Branch
30. Dancer in the Dark ( Megurine Luka ) - fatmanP
31. GALLOWS BELL ( Hatsune Miku ) - buzzG
32. Nenchaku-kei Danshi no 15-nen Nechinechi ( Hatsune Miku ) - Ie no Uchi de Manbou ga ShinderuP
33. Ie ni Kaeri to Tsuma ga Kanarazu Shindafuri wo Shite Imasu ( Hatsune Miku ) - HobohiP
34. Perfect Crime ( Megurine Luka & Kagamine Len ) - samfree
35. Tiger Rampage ( Kagamine Rin ) - sasakure.UK
36. Aitai ( GUMI ) - Dios
37. Hiraishin ( Kagamine Len ) - YuuyuP
38. DYE/Re:flection+ ( Megurine Luka ) - AVTechNO! & Treow
39. Seijaku-kei Shounen Shoujo ( Megurine Luka ) - fatmanP
40. Liar Girl ( Hatsune Miku ) - InokashiraP
41. Calc. ( Hatsune Miku ) - Jimmythumb
42. ALICE iN BLACK MARKET ( Hatsune Miku ) - LIQ
43. _theBlue ( Megurine Luka ) - Fukakuboryou
44. Last Song ( Megurine Luka ) - fatmanP
45. Millennia ( Hatsune Miku ) - Kanata Jun
46. For my soul ( GUMI ) - Junky
47. Cat Food ( Hatsune Miku ) - doriko
48. One Step Layered ( Hatsune Miku & Megurine Luka ) - Last Note
49. Happy Synthesizer ( GUMI & Megurine Luka ) - EasyPop
50. Cassiopeia ( Hatsune Miku ) - InokashiraP

Also, I request that if we were to do a covers post, the song limit should be over 100. "orz I swear a bunch of us will be in a conflict squeezing all those bandwagon favorites in there. /shot