Final answer:
The Beatles formed in 1960 and became popular in the mid-1960s. The counterculture movement reached its peak with the Woodstock concert in 1969.
Step-by-step explanation:
The Beatles formed in 1960 and quickly became a prominent British rock band. They represented the essence of suburban youth culture in the mid-1960s. However, the cultural landscape became more rebellious towards the end of the decade. In 1969, Woodstock, a concert that showcased rock 'n' roll, attracted half a million attendees, emphasizing the growing counterculture movement.