"Summer of '69" is a song recorded by the Canadian musician Bryan Adams from his fourth album, Reckless. The song is about a dilemma between settling down or trying to become a rock star. According to later claims by Adams, the title is a reference to the sex position, not the year, but Vallance disputes this.
Why is 1969 in so many songs?
Because from an astrological perspective it was a turning point. 1969 was the culmination of what began in the early 60s. It was rather like a full Moon.
Who is the girl in summer of 69?
The video: “Summer of '69” by Bryan Adams. The girl-now-woman: Lysette Anthony.