Eight Beat Measure is the all-male A Capella group from the Rochester Institute of Technology. They are really quite good.
This is “Honor Him/Now We are Free” from their 2010 album No Safety Nets. The version on the album is a little more polished, but that version is not available on YouTube. (Find it on Pandora, or iTunes, and elsewhere.)
You might remember these songs (by a different artist) as separate songs from the 2000 film Gladiator.