Three stars for the covers, five stars for the originals
Sure, it's for a good cause but the covers really can't match the amazing quality of the original versions.
The overall messages are good. While the songs may be angry (Gimme Some Truth) or very sad (Mother-"Children, don't do what I have done/I couldn't walk and I tried to run") they point out important issues like the need for responsible and loving parents and truth in media.
My biggest concern would be two uses of f---ing in "Working Class Hero."