Listen: N.E.R.D release first single in four years 'Squeeze Me'

2. 2 Chainz ft Pharrell - 'Feds Watching': We all know 2 Chainz isn't one of the best rappers out there, and it's a testament to Pharrell's production skills that on 'Feds Watching', he sounds pretty great. Pharrell's falsetto choruses, layered synths and sweeping, grandiose percussion combine wonderfully to simply make a massive tune, and proves Pharrell can still knock out a great rap song as well as playing to the mainstream, poppy side of things.