Thin Lizzy put the harmonizing guitars to work, some bands copied it.
But the thing about 70s rock they all had their own sound and approach. IMO, rocks most experimental days. Rock has so many branch off genres. Pop rock, hard rock, acid rock, blues rock, southern rock, progressive…etc. No other genre has that.
Some who didn’t make it in rock tried to rock country in the 90s.
Today, pick a genre, they all sound like the same band. It gets boring fast. Its what makes old rock shine on, because it was so diverse.
Lot of people say “ you worked with so many bands…blah blah blah”. True, but I started in 80, only 20 yrs old. I missed the cream of the crop, unless they did reunion tours. Disco and fluffy MTV was over-shadowing rock. Many of my fav bands were gone by then.
I was 15 in 75, deeply into drumming and electronics, first concert was Joe Walsh. Watched them set up snd then show. That put the hook in my mouth. “Thats what I want to do.”. 74-79 I either worked farms or home construction. Then I got my chance and bit hard. But really, the best was already old. So I made a living doing everything.
Today, even really good bands aren’t being brought out front by FM radio. They just become a blur of millions on YT. No one is putting it in your face like radio. Video (MTV) killed the radio star.
i didn’t get all the bands I really wanted. Even Black Sabbath, at the very top shelf they can afford to carry their own sound crew, so like BS or Eagles, I’m just hanging the sound system and hand it over. The mid level, these shows is where they didn’t afford it and thats when I mixed the most. When they are in my area I got a call. Doing it that way, I got a lot of bands in 6 mos, maybe 20. while someone on the road got 1-2 in that 6 mos. The same band.
Point being, 70s rock will live forever because its diverse. Some others are gone quick. Corporate greed decided instead of fans. If you’re good and stupid they want you.
I'll listen to anything thats done well. But IMO rock roots are deep. But as Tumor stated. Country tried to replace rock. And failed rock players jumped that wagon. Its Pop with rehearsed southern vocals. The only thing that makes it country. Many don't write their own lyrics, they get them from a lyric library people put in there hoping to make royalties. Nashville got too big. Same session musicians, same small group of engineers, therefore it all sounds the same. Bogus IMO. But it sells because old rock isn’t around to pummel it. However, old rock that can still do reunion tours are stuffing the house and making big money. Its a “hold my beer” time.
The 450 bands (4k concerts) I worked in 45 yrs doesn't even scratch the surface.