ART ROCK-WHEN THE MUSIC IS ART.
This spotify list reviewing the great moments of a style of music that is above all a way of life.
v yeah, it's all about concept as much as the music itself. Experimental rock is a Wikipedia genre, it's totally meaningless. Art & Prog both came from Psychedelic Rock and the big stage extravaganzas of early Floyd and those other guys. Same things to begin with, they both experimented with song structure and content, but basically branched into bands more focused on songs as a vehicle for performance art (not necessarily overly complex) vs those more focused on the instrumental, "technical" side (prog). Wikipedia article is awful but the talk page has some interesting stuff including on what happened to art rock after punk (RIO/ avant-prog is sort of written out of art rock a lot...) http://en.wikipedia.org/wiki/Talk:Art_rock#On_prog_and_art_rock.2C_new_wave
In the 1970's "art rock" was invented to describe bands who lay between mainstream music and progressive rock. It's as meaningful as "new wave" -- whatever that means. Bands like Be Bop Deluxe (wonderful band!) and Roxy Music fit in there. The definition is pretty narrow, and few of the Top Artists listed above fit in this genre. I'm only an expert because I lived through that era.
Wow, can't believe there are people out there that think all music is art (and so this tag doesn't make sense). Is it MTVs job to castrate the meaning of "art"? How can one call e.g. Linkin Park or Rihanna an art? Please, stay true, don't mess Art with Shit!