To no one's surprise, Harmonix, MTV and EA are preparing an encore for Rock Band later this year. Rock Band 2 is now official -- and it's coming to Xbox 360 this September, with "other platforms" releasing later in the year.

Before you start deleting the dozens of tracks you've downloaded for the first Rock Band, know that RB2 features ground-breaking cross-title compatibility. There is no distinction between Rock Band 1 and Rock Band 2 DLC. Any DLC you've previously downloaded will instantly work with Rock Band 2 and all DLC will continue to work with the original game from here and into eternity. While Harmonix has yet to reveal the number of tracks included on the RB2 disc, with the inclusion of all the previously released DLC, the set list at launch may top 300 songs.

"As successful as the original Rock Band continues to be, we've now had the benefit of the last eight months to listen to our fans' requests and to build upon that foundation," said Alex Rigopulos, co-founder and CEO of Harmonix. "Rock Band 2 is a second-generation band game that will elevate the music game experience to the next level."

As with Activision's recently announced Guitar Hero World Tour, Rock Band 2 features all master recordings on disc. You can also expect major improvements to online functionality and a more "party friendly" set-up so it's easy to get guests rocking out faster.

While all RB1 peripherals will work with the sequel, upgraded versions will be available in a bundle pack. Harmonix isn't revealing what these upgrades are just yet.

Rock Band downloads will continue to arrive weekly for both Xbox 360 and PS3. Each track you purchase is essentially extending your library of Rock Band 2 tracks. And even though PS3 owners will have to wait longer to get Rock Band 2 on disc, they will still have access to new downloadable content with RB1. With Rock Band DLC having now surpassed 15 million paid downloads, there appears no end in sight for the most successful digitally distributed product on 360 and PS3.

So why release first on Xbox 360? "Microsoft has been a great partner throughout the launch of Rock Band in the last year and their continued support is instrumental in supporting the more advanced features and cross title compatibility we will have in Rock Band 2," a Harmonix representative told IGN. "Of course, our goal is to make Rock Band 2 accessible to all and we look forward to bringing Rock Band 2 to all relevant platforms later this year."

For more details on Rock Band 2, check out IGN's exclusive interview, which is packed with info.

Holy shit, that drum set is SICK. How much will it cost me though? :(

Artist Song Title Decade
1. AC/DC “Let There Be Rock” 1970s
2. AFI “Girl’s Gone Grey” 2000’s
3. Alanis Morissette “You Oughta Know” 1990’s
4. Alice in Chains “Man in the Box” 1990’s
5. Allman Brothers “Ramblin’ Man” 1970’s
6. Avenged Sevenfold “Almost Easy” 2000’s
7. Bad Company “Shooting Star” 1970’s
8. Beastie Boys “So Whatcha Want” 1990’s
9. Beck “E-Pro” 2000’s
10. Bikini Kill “Rebel Girl” 1990’s
11. Billy Idol “White Wedding Pt. I” 1980’s
12. Blondie “One Way or Another” 1970’s
13. Bob Dylan “Tangled Up in Blue” 1970’s
14. Bon Jovi “Livin’ on a Prayer” 1980’s
15. Cheap Trick “Hello There” 1970’s
16. Devo “Uncontrollable Urge” 1980’s
17. Dinosaur Jr. “Feel the Pain” 1990’s
18. Disturbed “Down with the Sickness” 2000’s
19. Dream Theater “Panic Attack” 2000’s
20. Duran Duran “Hungry Like the Wolf” 1980’s
21. Elvis Costello “Pump It Up” 1970’s
22. Fleetwood Mac “Go Your Own Way” 1970’s
23. Foo Fighters “Everlong” 1990’s
24. Guns N’ Roses “Shackler’s Revenge” 2000’s
25. Interpol “PDA” 2000’s
26. Jane’s Addiction “Mountain Song” 1980’s
27. Jethro Tull “Aqualung” 1970’s
28. Jimmy Eat World “The Middle” 2000’s
29. Joan Jett “Bad Reputation” 1980’s
30. Journey “Anyway You Want It” 1970’s
31. Judas Priest “Painkiller” 1990’s
32. Kansas “Carry On Wayward Son” 1970’s
33. L7 “Pretend We’re Dead” 1990’s
34. Lacuna Coil “Our Truth” 2000’s
35. Linkin Park “One Step Closer” 2000’s
36. Lit “My Own Worst Enemy” 1990’s
37. Lush “De-Luxe” 1990’s
38. Mastodon “Colony of Birchmen” 2000’s
39. Megadeth “Peace Sells” 1980’s
40. Metallica “Battery” 1980’s
41. Mighty Mighty Bosstones “Where’d You Go” 1990’s
42. Modest Mouse “Float On” 2000’s
43. Motorhead “Ace of Spades” 1980’s
44. Nirvana “Drain You” 1990’s
45. Norman Greenbaum “Spirit in the Sky” 1960’s
46. Panic at the Disco “Nine in the Afternoon” 2000’s
47. Paramore “That’s What You Get” 2000’s
48. Pearl Jam “Alive” 1990’s
49. Presidents of the USA “Lump” 1990’s
50. Rage Against the Machine “Testify” 1990’s
51. Ratt “Round & Round” 1980’s
52. Red Hot Chili Peppers “Give it Away” 1990’s
53. Rise Against “Give it All” 2000’s
54. Rush “The Trees” 1970’s
55. Silversun Pickups “Lazy Eye” 2000’s
56. Smashing Pumpkins “Today” 1990’s
57. Social Distortion “I Was Wrong” 1990’s
58. Sonic Youth “Teenage Riot” 1980’s
59. Soundgarden “Spoonman” 1990’s
60. Squeeze “Cool for Cats” 1970’s
61. Steely Dan “Bodhitsattva” 1970’s
62. Steve Miller Band “Rock’n Me” 1970’s
63. Survivor “Eye of the Tiger” 1980’s
64. System of a Down “Chop Suey” 2000’s
65. Talking Heads “Psycho Killer” 1970’s
66. Tenacious D “Master Exploder” 2000’s
67. Testament “Souls of Black” 1990’s
68. The Donnas “New Kid in School” 2000’s
69. The Go-Go’s “We Got the Beat” 1980’s
70. The Grateful Dead “Alabama Getaway” 1980’s
71. The Guess Who “American Woman” 1970’s
72. The Muffs “Kids in America” 1990’s
73. The Offspring “Come Out & Play (Keep ‘em Separated)” 1990’s
74. The Replacements “Alex Chilton” 1980’s
75. The Who “Pinball Wizard” 1960’s
Bonus Artist Bonus Song Title Decade
76. Abnormality “Visions” 2000’s
77. Anarchy Club “Get Clean” 2000’s
78. Bang Camaro “Night Lies” 2000’s
79. Breaking Wheel “Shoulder to the Plow” 2000’s
80. The Libyans “Neighborhood” 2000’s
81. The Main Drag “A Jagged Gorgeous Winter” 2000’s
82. Speck “Conventional Lover” 2000’s
83. The Sterns “Supreme Girl” 2000’s
84. That Handsome Devil “Rob the Prez-O-Dent” 2000’s

14. Bon Jovi “Livin’ on a Prayer” 1980’s

Stocking the digital bins, EW.com has learned exclusively, will be seminal full albums by Foo Fighters (The Colour and the Shape), Red Hot Chili Peppers (Blood Sugar Sex Magik), Jane's Addiction (Nothing's Shocking), Megadeth (Peace Sells... But Who's Buying) and Stevie Ray Vaughn (Texas Flood), along with a specially-compiled No Doubt Best Of collection. All are slated to roll out in the coming months, according to MTV Games.