Congratulations on your son rising up out of hip-hop. The seminal musicians you list served me well when learning guitar as a teen.
Neil Young's "After the Goldrush" is right there with any album that can be put on a list from the '70s. His politics are convenient for a person from his period and considerable financial position. I will say he calls out hypocrites from the left, as well as the right.
His politics are convenient for a person from his period Everybody keeps saying he is liberal. He's more complex than that.
He was a very big supporter of Ronald Reagan (much to the chagrin of his mates)
He gets "poisoned" when he hangs with CSN (true gag reflexive liberals), but gets "better" when he leaves their sorry "Thrasher asses" in the lurch (over and over again)