Does anyone ages 25 and under know who these people/groups are?

Well, if you're under 25 and know them, it stands to reason that other people under 25 do.

In fact, most people should know Bach and Mozart. Anyone alive should know of George Harrison I think most people know of them even if they don't realise it.

A quick Google tells me that Guthie is an American Folk singer, and that sort of music doesn't really make it over here in a big way. So that may not be an age thing, but a cultural thing.

Arlo Guthrie,wow there's a name I haven't heard in years.The last song I heard of his was Alice's Restaurant made into a movie,or vice versa.

Actually you have a point there, I wouldn't know who Arlo Guthrie is if I weren't such a big fan of Bob Dylan. Books about Bob Dylan mention Woody Guthrie a lot and after that, Arlo is mentioned too.

Guthrie is the only one I had never heard of. Seriously though, who doesn't know Harrison? Or Bach and Mozart? Really, now. Have a little faith in the younger generation; we're not actually that ignorant.

Right?

Yep. Know the last three. As for the first two, never heard of the gits lol.

I know Guthrie, Bach, and Mozart

I know about the bottom three.