Simply put, this album is RAW.
This album goes to show that you don't really have to be the best musicians in the world (or that you can be too high on heroin to care?), to come out with an amazing, whiskey-soaked, blues album.
The guitars are off beat and all over the place, and their lead guitarist, Brian Jones, didn't even show up to half of the recording sessions, and yet, the raw emotion that comes out of this album, even on jokey songs like "Dear Doctor", is incredible.
This album was also one of the first records I heard that had epic 6 minute songs without any key changes. Key changes are hard. Key changes in hip-hop, where just about everything is sample based, are nearly impossible. This record helped show me how to keep songs moving, or how to change what you're playing without changing the notes...
Download the entire album for free here... and then go buy the other 21 albums, 50 some odd bootlegs, five hundred t-shirts, and official Rolling Stones Metal Detector.
Other great Stones albums include: Aftermath, Sticky Fingers, and Let it Bleed.