Greatest rock bands ever list?

Most of these groups aren't even rock, most of this music is absolute modern day garbage, isn't Lil' Wayne a rapper? The only good or half decent groups you have on that list are Nirvana, Led Zeppelin, and Metallica. If you want some of the greatest rock bands ever, try groups such as, The Doors, Pink Floyd, Rolling Stones, The Who, and other classic groups, definitely from the 60's-70's. Seriously dude, half the stuff on that list is complete garbage, and not even considered rock.