great point ! No, no. Certain mind-altering substances can enhance any listening experience in surprising and delightful ways - that's true, however one doesn't need to be under the influence of psychotropic drugs to "get" the Dead. It is really a just a matter of one's level of consciousness and perspicacity. Having an undersdanding of the origins of the stylistic elements of their music offers an insight into the ways many followers approach the Dead's music - being tuned-in to the ways in which they combine elements of Rock, Folk, Dixieland Jazz, Bluegrass, Country Blues, and Gospel is entirely unique in the context of popular music, purely organic (probably one of, if not the last, band to hybridise styles in this way), and improvisational in essence.