Pumpernickel coffee flavor, and earthy aroma. To achieve this, loaves are baked in long narrow lidded pans 16 to 24 hours in a low-temperature (about ), steam-filled oven. Like the French "pain de mie", Westphalian pumpernickel has little or no crust. It is very similar to rye "Vollkornbrot", a dense rye bread with large amounts of whole grains added. Pumpernickel varieties are popular in the Netherlands, under the name , where it has been a common part of the diet for centuries, and in Denmark where is a staple. German pumpernickel is often sold sliced in small packets in supermarkets, where
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