«In truth, I was an occasional bass player. It says so on Led Zeppelin I, next to my name: vocals, harmonica and occasional bass. Very occasionally - once, I think, since 1968. How in God's name that ended up on the cover is so funny. I'm sure Jonesy [John Paul Jones] didn't like it [laughs]. But I suppose every time he fucked up he could say it was me.» (Robert Plant em entrevista para a Rolling Stone, em 2005.)