There are at least 3 artists by the name UR:

Artist 1:

UR is also Underground Resistance. Underground Resistance is probably the most militantly political outcropping of modern urban American techno. Combining a grubby, four-track aesthetic, an almost strictly DIY business philosophy, and an oppositional, militaristic ethos similar to Public Enemy without the drama (or the familiarity; the members refuse to be photographed without bandanas obscuring their identities), UR have redirected their portion of the Detroit techno legacy to social activist ends, trading mainstream popularity and financial success for independence and self-determination.

Begun in the early '90s by second-wave trinity Jeff Mills, "Mad" Mike Banks, and Robert "Noise" Hood, UR adapted the flavor and kick of early Detroit techno to the complex social, political, and economic circumstances in the wake of Reagan-era accelerated inner-city decline, and was formed as an outlet for uncompromising music geared toward awareness and change.

Artist 2:
UR is one of the seven Secret Chiefs 3 sub-bands, focused on "Americanized Easternisms" and other types of fusion music. UR has so far released three singles: Kulturvultur/Drive, Circumambulation/Labyrinth Of Light and The Left Hand Of Nothingness/Personnae: Halloween, the final one being a collaboration with The Electromagnetic Azoth, also a sub-band of Secret Chiefs 3. A full album is rumored to be in the works.

Artist 3:
UR is a band from Italy.