I actually have an appreciation for all types of rock and roll music. I think there is some really good music no matter what the genre or sub-genre. There is also some really bad music in all of them too. I also have a respect for artists’ talents whether I am listening to a studio version or a live version of a song. Personally, I don’t necessarily believe that an artist’s talent is showcased more in live performances. I have an immense appreciation for the song-writing process and the creativity involved in turning a few words or notes into a great piece of art. For example, in the case of the Eagles, I believe one of their biggest strengths as a band was their talent for collaborating in the songwriting process and arranging and perfecting their art in the studio.
I’m not a huge Beach Boys fan either, but I did not base my choices on whether or not I like the artist. And there is no question that they made some great music. Again, just because they’re not my favorite doesn’t mean I can’t appreciate that their music was innovative, creative, and influential. For the record, I feel the same way about David Bowie.
In the U.S., FWIW is a rock anthem that has a lot of significance that it may not have throughout the rest of the world. My understanding is that you wanted us to select different artists’ most definitive songs. I have to disagree with your assessment that Jimi Hendrix and Cream were the most definitive acts of the mid-60’s. Again, I would give that distinction to The Beatles and Bob Dylan. Sorry, but, again, I don’t judge an artist’s influence and impact based on whether or not they were doing live performances.
Absolutely not!

The title of this thread is ‘Definitive rock artists and songs of each year!’ and there were no rock artists any more definitive in 1978 than the Bee Gees.
Cosec – I would encourage you to familiarize yourself with some of this 'soft' music. Focusing on only one aspect of the creative process provides a narrower view of the artistry involved because you disregard everything that’s involved before a song ever even gets to a staged performance. Maybe if you broaden your horizon’s, you’d gain a better appreciation for the entire artistic process of creating, recording, and performing music. Then, even if you don’t love something, you can still recognize it as good art.