Who said "Rock and roll gives voice to the voiceless"?

This quote is attributed to Led Zeppelin.

Rock and roll gives voice to the voiceless - Led Zeppelin

"Rock and roll gives voice to the voiceless"

Led Zeppelin Justice

Rock Band British 1968–1980

"I've been dazed and confused for so long it's not true"

"The song remains the same"

"Whole lotta love is what I need"

"Black dog on my trail"

"Justice must always prevail."

"You think I'm just some animal?"

"Fighting for what's right never gets easier."

"Justice is worth fighting for."