In February 1968, the English rock band the Beatles travelled to Rishikesh in northern India to take part in a Transcendental Meditation (TM) training course at the ashram of Maharishi Mahesh Yogi. The visit followed the group's denunciation of drugs in favour of TM[1] and received widespread media attention. The band's interest in the Maharishi's teachings was led by George Harrison's commitment,[2][3] and it changed Western attitudes about Indian spirituality and encouraged the study of Transcendental Meditation.[4] The visit was also the most productive period for the Beatles' songwriting.
the rest is on wiki if you wish to complete the write up
https://en.wikipedia.org/wiki/The_Beatles_in_India
their music altered during this period but was not anything but good..