It's in D. Thanks for watching! Actually, it might be a bit more complicated than that. It, along with many other songs in Rock and Pop music, uses a chord loop vamp as its harmonic scheme, and because of that, it might show something that ethnomusicologist Peter Manuel calls "Dual Tonicity." So...it's kind of in both the key of D and G at the same time. Neat! Ethan Hein’s Blog Post on Phillip Tagg http://www.ethanhein.com/wp/2017/philip-taggs-everyday-tonality/ Phillip Tagg’s Everyday Tonality https://scholar.google.com/scholar?q=Everyday%20Tonality:%20Towards%20a%20Tonal%20Theory%20of%20What%20Most%20People%20Hear,%20by%20Philip%20Tagg Peter Manuel’s Paper on Dual Tonicity in Spanish/Latin American Muiscs https://www.researchgate.net/publication/215646571_From_Scarlatti_to_Guantanamera_Dual_Tonicity_in_Spanish_and_Latin_American_Musics Paul David's rock video https://youtu.be/eBXaKNAfmHw Twitter thread https://twitter.com/adamneelybass/status/1200820755593912323 Sweet Home Alabama Live versions used https://youtu.be/6GxWmSVv-cY https://youtu.be/sDz2rVgv0uM Celia Cruz + Fania All Stars - Guantanamera https://youtu.be/1_uamNoDhP4