This song by Bruno Mars and Travis McCoy is in A.
These are the “cheat” chords I played…
Part 1a: A - C#7
Part 1b: F#m7 - E
Part 2a: D2 - E - F#m7
Part 2b: D2 - E - F#m7
Part 2c: D2 - E - A2 - E/G# - F#m7 - F#m7/E
Part 2d: D2 - C#7 - F#m7
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