"Acid Folk" can be mentioned as another musical style with hallucinogenic approach. Psych Folk or Psychedelic Folk are other names for this genre, and is vaguely defined as a rock subgenre due to the mixture of folk rock and psychedelic rock. This is a style lacking in strict definitions, and it is contested whether or not the term was actually used at what is deemed the dawn of the genre. It's an undeniable fact that the Acid Folk scene gained some popularity by the efforts of artists in "The Folk Revivalism", but it's important to remember that there were two distinctly different approaches taken by those who helped shape the genre in the mid 1960's. Some folk singers approached a psychedelic rock structure as was popular at that time, while some psychedelic rock outfits tried to absorb and incorporate techniques and elements from folk rock. Both have great importance in the development of Acid Folk, and this may be the reason that strict definitions of the genre cannot be given. In view of the history, it's no exaggeration to claim that TYRANNOSAURUS REX, SYD BARRETT or THE INCREDIBLE STRING BAND in UK rock scene seasoned the "traditional" Acid Folk with a more progressive spice. They, as eccentric or heretical rock outfits, accepted and incorporated Middle-Eastern and Oriental elements or instruments, and the result was the foundation for the current progressive Acid Folk movement. And in the Eastern parts of the world, different acid streams was provided by artists such as TAJ MAHAL TRAVELLERS or MAGICAL POWER MAKO who exerted a great influence on younger progressive bands. Their amazing achievements resides in the twilight zone between the Prog Folk and Psychedelic Prog subgenres.