The song title came from the wife of science fiction writer Robert Heinlein. Satriani explained to Digital Spy
: "As the story goes, his wife was complaining about a bitter winter, and she said, 'I wish there were a door into summer.' He wrote a book with that title, although it was about something else altogether. Being a big reader of science fiction, I thought it sounded cool.
"It's funny, because (The Extremist
track) 'Summer Song' was going to be called 'A Door Into Summer,' but I changed it," he continued. "For some reason, I thought at the time that it was just too much. Also, I remember riding with one of the promo guys for Relativity Records, and he said, 'If I could just have that one summer song... ' That stuck in my head. I was reminded of the original title when John Cuniberti and I were doing this massive remastering of my catalogue. There it was on these boxes of tapes: 'A Door Into Summer.' I remember writing it years ago, thinking about that very first day of summer."