The intro to Ed Sheeran's Shape of You (released January 6, 2017) is very similar to the intro to Sia's Cheap Thrills (released February 11, 2016). Both feature a marimba-sounding synth playing staccato quarter note triplets for each chord. In terms of chord structure, Shape of You (in the key of E) follows a vi-ii-IV-V (or minor 6, minor 2, 4, 5) progression, while Cheap Thrills (in the key of A) follows a vi-IV-I-V (or minor 6, 4, 1, 5) progression. Shape of You is also slightly reminiscent of TLC's No Scrubs (released January 23, 1999), which is in the key of B (really G# harmonic minor), and follows a ii-vi-V/vi-vi (or minor 2, minor 6, dominant chord of the 6, minor 6). In particular, the scansion of the verse vocal melody is similar. [h/t to A. Zucker for suggesting this one!]
As a musician and composer, I’m often struck by similarities between pop songs. If you’ve ever listened to a tune on the radio and thought to yourself, “this sounds really familiar,” or “what does this melody remind me of,” (or more bluntly, “this song is a rip-off of …”) then you have shared in the experience.