Dunno who coined the phrase, so I'll give credit to Kenneth "Kenny G" Goldsmith (not to be confused with the permed schlockmeister), a writer and WFMU DJ. A collection of his writings (A Popular Guide to Unpopular Music) is at http://wfmu.org/~kennyg/popular.html, featuring stuff on such Top 40 alternative techno rappers as John Cage, Robert Ashley, and Sofia Gubaidulina. Actual non-dead composers (Cage was just napping, honest). And much, much more! Now how much would you pay?