Pretty self explanatory, recommend me Thin Lizzy, Rose Tattoo, Rainbow, AC/DC, Kiss, UFO etc etc's best stuff. Plus any other classic bluesy/hard rock type stuff you can think of, strictly 70s. Cheers.
AC/DC = Sucks
Black Sabbath and Motorhead - I dunno how to classify their 70s stuff. Somewhere in between metal and hard rock.
Stevie Ray Vaughan - Not actually 70s, but you wouldn't really know it. Amazing guitarist. Get Couldn't Stand the Weather
Mountain. Their first album.
Led Zeppelin ruled, they could be heavy, soft, or anything in between. The music is fun to play, the riffs are amazing and timeless. Jimmy Page is a true wizard, and I think the song remains the same dvd proved that.