Heading home from a hike a year and a half or so ago, I was driving through a mountain pass, and my stereo was going in and out, and I heard this song, and I thought, "Is this a Zeppelin song that I've never heard?" And just as the song ended, the DJ actually said something to the tune of, "This is a new release off of the EP from Greta Van Fleet." As soon as I got home and turned on my PC, I looked these kids up, and I was impressed. I hope they go far and release several albums/discs.
As a side note, and I am sure I've mentioned this before, but the first two cassette tapes that I ever bought with birthday money no less, when I turned 12, were Led Zeppelin 4 and Led Zeppelin In Through The Outdoor. It's not so much a "rip off" of LZ as it is a homage to one of the greatest rock bands of all time.