“This collection, assembled in honor of Amnesty International’s 50th birthday, is stuffed with 80 artists, from Pete Seeger (folk-music deity, b. 1919) to Miley Cyrus (hot mess, b. 1992). Revelation and humor are in as short supply as hip-hop; instead, you get a good catchall for a great cause, with head-scratchers and surprises side by […]”