Bone Thugs 'n' Harmony -

"A multi-Grammy Award winning American gangsta rap group from Cleveland, Ohio, known for their fast rapping style and harmonizing vocals. The group is one of the best-selling rap groups of all time, with thirty-five million albums sold worldwide.[1] They have also won numerous awards, including a 1997 Grammy in the category of Best Rap Performance for 'Tha Crossroads'. - Wikipedia