Hope you don't mind an older person's perspective. I know we've had favorite rock band topics before but good idea to branch out to the different genres and sounds.
I couldn't possibly list all of the greatest and/or most influencial bands/artists, because I know I'd leave so many out.
Among my personal favorite artists are: Beatles, Rolling Stones, Led Zep, Eagles. Personal favorite "songs" that to me are true classics: Stairway to Heaven, Hotel California, You Can't Always Get What You Want, The Wall.
What's interesting is, that although before Rock & Roll, there was different kinds of music, I doubt that there is such a variety of sounds in any other gnere(i.e. punk, Heavy Metal, Grunge and many I never heard of I'm sure) that still fall under the "Rock" category.
In my day there was Motown & The California sound; The Righteous Brothers were known as "Blue Eyed Soul", all extremely popular with their own distinct "sound;" all different, yet all R & R.
What were Sinatra, Martin, Bennett called in their day, before R & R.,...just pop artist I think. Music has really branched out hasn't it? We've come a long way baby!!!!
TIS