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Question:what scale or mode is used on janis joplin sumertime song.

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I'm not sure about Janis Joplin's rendition it's been years since I've heard it. But the original key was Am, spent a moment in C Major in mm. 13 - 14 before returning to Am, form A - B- A- C. Primarily minor borders on pentatonic except for the B natural in mm. 7 - 8.