What is the harmony in the song someone like you?

In Adele's "Someone Like You," the harmony primarily revolves around a simple yet emotive chord progression that supports the vocal melody. The song is primarily in the key of A major, featuring chords like A, E, F#m, and D, which create a bittersweet atmosphere that complements the lyrics' themes of heartbreak and acceptance. The use of piano as the main accompaniment enhances the song's emotional depth, allowing Adele's powerful vocals to shine through. Overall, the harmony contributes significantly to the song's poignant and reflective mood.