The use of quintessence became popular within medieval alchemy. Aether also has the name "quintessence", meaning, literally, "fifth being". A process given for the creation of quintessence is distillation of alcohol seven times. An Altermere is an Astral Drop brought to life through the power of Quintessence. "P-funk" also came to mean something in its quintessence, of superior quality, or "sui generis". It was noted that there was very little presence of quintessence within the terrestrial sphere. It is closely associated to the concepts of dark energy and quintessence. Life on the Maidan is the quintessence of life in Kolkata. Such is the quintessence of mind. Peter Drucker believed market research to be the quintessence of marketing. That is the quintessence of the Red Terror. Lyrics for the track "Quintessence" were written by Varg Vikernes. Jones' Quintessence continues to record sporadically. No evidence of quintessence is yet available, but it has not been ruled out either. Other billed acts of note were, Steamhammer, Quintessence, Stackridge, Al Stewart and Keith Christmas.