Unfair to rock and roll artists

[Rockjock]

I viewed the history of rock n roll and found it to be very much rock oriented by overlooking and not recognizing the music of the great pop musicians in the field of rock and roll. I truly feel that in the field of rock and roll, all the musicians that contributed their talents to rock and roll over the years deserve equal recognition. There was also much hatred towards disco especially in the 70s.
Please comment on this unjust contribution by many of the rock artists featured in this documentary.