Provel cheese answer for the origin of the name, although one popular theory is that it is a portmanteau of the words provolone and mozzarella, two of the cheeses for which it is substituted. Another rumored name origin is that "Provel" comes from the name provolone, removing the "-one" as it is made up of more than one type of cheese. As a processed cheese, Provel is subject to FDA guidelines on labeling cheese. The trademark on the Provel name, first used in 1947, is currently held by the Churny Company, Inc. of Glenview, Illinois. Churny is now a wholly owned subsidiary
What Is and What Should Never Be descending riff [of "What Is and What Should Never Be"] is amazing: It's like a bow is being drawn back, and then it releases. The rhythm of the vocals is almost like a rap. It's insane — one of their most psychedelic songs." This was also one of the first songs recorded by the band for which Robert Plant received writing credit. According to rock journalist Stephen Davis, the author of the Led Zeppelin biography "Hammer of the Gods: The Led Zeppelin Saga", the lyrics for this song reflect a romance Plant had with his wife's younger sister. "What Is