According to Oxford Dictionaries Online , it possibly originated at a pop festival in the 1960s when , on hearing the name being announced many times over a loudspeaker , the crowd took it up as a chant . The cry was picked up by others and led to random shout of " Wally " being heard at rock concerts all over Britain . It was still being called out at the 1979 Led Zeppelin Knebworth Concerts
Knebworth Concerts
Knebworth Festival 1979
Wally (anonymous)