For those that are disrespecting the Beastie Boys stating they aren't hip hop... they just simply never heard or truly listen to some of the work the Beastie boys put out and more than likely, are just a bunch of kids.
The Beastie Boys were a fusion not just of hip hop, but as they got older, their sound became a fusion of different sounds that they wanted to implement into their music while keeping their roots. Even though at the beginning of their career they were formed as a punk rock group... later on, they adopted and master an art form that for many years they help not only to laid the foundation but open the doors for others to adopt as well. In conclusion, they're pioneers of hip hop, because along Run DMC and earlier acts, they brought hip hop to the masses and they began the foundation for hip hop to become the global force that it is today.
So for those that don't get the importance and huge loss that we've received today, I hope you go back and listen to their music, because it'll give you a change of heart and i hope i gave you something to think about.