Two Weeks of Hip Hop by The Hood Internet
Two Weeks by Grizzly Bear + Hip Hop by Dead Prez

Check out their Mixtape Volume 4 for plenty more great mashups.

(posted by indieandyy)

Staring At the Sun Hollertronix remix ft/ Afrika Bambaataa
originally by TV On the Radio 
(via nedhepburn)

Tried to find more info on this (re)mix (mash-up). From what I gather, it may or may not involve Diplo and/or Dead Prez’s “Hell Yeah.”
—indieandyy