Must B 21 adalah album musik kedua dari penyanyi hip-hop asal Amerika Serikat, will.i.am, yang dirilis pada tanggal 23 September 2003.
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1. | "Take It" (duet KRS-One) | 2:49 |
2. | "Nah Mean" (duet Phife) | 3:48 |
3. | "B Boyz" (duet MC Supernatural) | 2:56 |
4. | "Here To Party" (duet Flii, Planet Asia & Kron Don) | 3:12 |
5. | "Bomb Bomb" (Interlude) | 0:23 |
6. | "Bomb Bomb" (duet MC Supernatural) | 3:25 |
7. | "Swing By My Way" (duet John Legend) | 3:49 |
8. | "It's OK" (duet Triple Seven & Dante Santiago) | 3:39 |
9. | "Mash Out" (Interlude) | 0:39 |
10. | "Mash Out" (duet MC Lyte & Fergie) | 3:09 |
11. | "Ride Ride" (duet John Legend) | 3:16 |
12. | "Sumthin' Special" (duet Niu, Dante Santiago & Taboo) | 3:55 |
13. | "Sumthin' Special" (Interlude) | 0:50 |
14. | "I'm Ready (Y'All Aint Ready For This)" (duet Tash & MC Supernatural) | 3:40 |
15. | "We Got Chu" (duet Planet Asia & Flii) | 3:52 |
16. | "Go!" (Interlude) | 1:32 |
17. | "Go!" | 3:54 |