Instruct: Classify Amazon reviews into positive or negative sentiment
Query: John's & Yoko's Butchery

Jamrag? What the heck is Jamrag? That's really Frank Zappa's King Kong, but Lennon stole the writing credits. Lennon and Ono jammed with the Mothers that night at the Filmore, and they agreed with Zappa that the show would be taped and they would mix it together so they could release it. John and Phil Spector, behind Zappa's back, set out to release it without Frank's permission. They mixed out the vocals on Scumbag ... the only vocals, and did a host of other baffling, stupid things. A horrible injustice and a mess of a record. No wonder Frank hated collaborating as much as he did.