Originally Posted by PeterG
"YES are the pioneers for the use of synthesizers and sound effects in modern music .."
Aren't they referring to Pink Floyd?
Chronologically Yes beat PF in the synth department but I think Floyd used sound effects earlier(ie Bike, several species of small furry animals, Alan's psychedelic breakfast, etc).
As far as I know, ELP were the first prog band to use a synth(the first album released in late 1970)although there were probably others around the same time.