important r&b/rap collaborations

this is obviously an incomplete list, but in no particular order.

• method man & mary j:  i’ll be there for you/you’re all i need to get by
• nas & lauryn hill: if i ruled the world
• mariah carey & odb: fantasy (remix)
• jay-z & mary j: can’t knock the hustle
• ja rule & ashanti: mesmerize
• jay-z & beyonce: crazy in love
• the roots & cody chestnutt: the seed 2.0
• ciara & ludacris: oh
• aaliyah & timbaland: we need a resolution
• ll cool j & boyz II men: hey lover
• pras, odb, & mya: ghetto supastar
• blackstreet & dr. dre: no diggity
• nelly & kelly rowland: dilemma
• tupac & k-ci & jo-jo: how do you want it
• jay-z & alicia keys: empire state of mind
• missy elliott & tweet: oops (oh my)