Single Ladies by Beyonce is played in the key of Db at a intermediate difficulty level, originally released in the 2000s. It uses 4 chords — Db Ab Bbm Gb — arranged in the I-V-vi-IV progression.
About the I-V-vi-IV progression
The I-V-vi-IV pattern is the most common chord progression in modern pop. It moves from the tonic home chord to the dominant (V), drops to the relative minor (vi) for emotional weight, then resolves through the subdominant (IV) back to home. Hundreds of hit songs are built on this shape, from "Let It Be" and "Don't Stop Believin'" to nearly every four-chord Top 40 song of the past thirty years.
Playing in the key of Db
Db major uses Db, Gb, and Ab — three barre chords. Guitarists almost always capo up to a friendlier key (capo 1st fret plus C-major shapes works cleanly).
Related songs
More songs using the I-V-vi-IV progression
Learn to play Single Ladies by Beyonce on guitar. It sits in the key of Db and uses the I-V-vi-IV progression with the chords Db Ab Bbm Gb.