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The song features a solo from bluesy-rock guitarist Gary Clark Jr.. When explaining his contribution to the song, he only had good things to say about Alicia. She’s just sweet, genuine, people. I mean, she’s Alicia Keys. I’ve been a fan for a minute. She’s very professional. I went in and I was like, ‘What do you want me to do?’ and she was like, ‘This is the song. You just do what you do, and we’ll see what happens.’ It was one of the best studio experiences I’ve ever had.

Traffic drummer Jim Capaldi started writing this song in Morocco, where he was getting ready to make a movie called Nevertheless with actor Michael J. Pollard. The film project fell through, but did lead to one of Traffic's best-known songs.Said Capaldi: "Pollard and I would sit around writing lyrics all day, talking about Bob Dylan and the Band, thinking up ridiculous plots for the movie. Before I left Morocco, Pollard wrote in my book 'The Low Spark of High Heeled Boys.' For me, it summed him up. He had this tremendous rebel attitude. He walked around in his cowboy boots, his leather jacket. At the time he was a heavy little dude. It seemed to sum up all the people of that generation who were just rebels. The 'Low Spark,' for me, was the spirit, high-spirited. You know, standing on a street corner. The low rider. The 'Low Spark' meaning that strong undercurrent at the street level."