Real easy. All you do is run a search under his name, and anything that's tagged with his first and last name pops up, then sort under "date added". That way, the most recent vids that are tagged under his name come up first. Granted, there's more than one Michael Gruber out there, but if you take a minute to read the discription, you can figure out if it's something concerning Our Mike or someone else. That was how I found someone had posted a performance from "White Christmas" a few months back.
What can I say? When you're a follower of someone's work and have internet access, you can get real creative on how to find stuff!! :)