Everybody should know who these guys are but just in case, here is my endorsement. Ask Teresa, she thinks I’m obsessed with them (I’m not but I do enjoy their music).
These guys are wonderful artists – with a wry sense of humor. Anyone who needs a little uplifting should drop by their YouTube channel and check them out. (Sorry I can't link-- I'm at work and we don't have access to YouTube).
BTW, my favorite is their rendition of “Somewhere Over the Rainbow.” Have fun.