In E♭ major, the I–V–vi–IV progression is E♭ – B♭ – Cm – A♭. The most used loop in modern pop: a bright start, a lift to the minor vi, and IV leading back home.
The library above is set to I–V–vi–IV in E♭ major. Press Play to hear it with strummed guitar, bass and drums in a pop groove, tap any chord to hear it on its own, or pick another key or a capo.