embraced certain types of "groovy" science and technology. Examples include surfboard design, renewable energy, aquaculture and client-centered approaches to midwifery, childbirth, and women's health. Authors Stewart Brand and John Markoff argue that the development and popularization of personal computers and the Internet find one of their primary roots in the anti-authoritarian ethos promoted by hippie culture. Distinct appearance and clothing was one of the immediate legacies of hippies worldwide. During the 1960s and 1970s, mustaches, beards and long hair became more commonplace and colorful, while multi-ethnic clothing dominated the fashion world. Since that time, a wide range of personal appearance options and clothing styles, including nudity, have become more widely acceptable, all of which was uncommon before the hippie era. Hippies also inspired the decline in popularity of the necktie and other business clothing, which had been unavoidable for men during the 1950s and early 1960s. Additionally, hippie fashion itself has been commonplace in the years since the 1960s in clothing and accessories, particularly the peace symbol. Astrology, including everything from serious study to whimsical amusement regarding personal traits, was integral to hippie culture. The generation of the 1970s became influenced by the hippie and the 1960s countercultural legacy. As such in New York City musicians and audiences from the female, homosexual, Black, and Latino communities adopted several traits from the hippies and psychedelia. They included overpowering sound, free-form dancing, multi-colored, pulsating lighting, colorful costumes, and hallucinogens. 1960s Psychedelic soul groups like the Chambers Brothers and especially Sly and The Family Stone influenced George Clinton, P-funk and the Temptations. In addition, the perceived positivity, lack of irony, and earnestness of the hippies informed proto-disco music like M.F.S.B.'s album Love Is the Message. Disco music supported 70s LGBT movement. The hippie legacy in literature includes the lasting popularity of books reflecting the hippie experience, such as The Electric Kool-Aid Acid Test. Music In music, the folk rock and psychedelic rock popular among hippies evolved into genres such as acid rock, world beat and heavy metal music. Psychedelic trance (also known as psytrance) is a type of electronic music influenced by 1960s psychedelic rock. The tradition of hippie music festivals began in the United States in 1965 with Ken Kesey's Acid Tests, where the Grateful Dead played tripping on LSD and initiated psychedelic jamming. For the next several decades, many hippies and neo-hippies became part of the Deadhead community, attending music and