People that have been rumored or confirmed to be working on Unapologetic
Pharrell Williams
Neyo
David Guetta
Kuk Harrel (Umbrella,Breakin Dishes,Only Girl)
Nicky Romero (DJ/producer)
Burns (DJ/producer)
Labrinth (UK producer/song-writer)
Fazer (UK rapper/producer)
Chase & Status (Wait Your Turn, Red Lipstick)
Makeba Riddick (Rude Boy, Love The Way You Lie)
Kelly Sheehan (Rita Ora’s How We Do)
Knife Party (Australian house/dubstep duo)
Stargate (wrote/produced the 1st single)
Sia Furler (wrote/produced the 1st single)
Benny Blanco (wrote/produced the 1st single)
Rob Swire (Rude Boy)
Chuck Harmony (Russian Roulette)
Claude Kelly (Price Tag, Party In The USA)
James Fauntleroy (The Last Song, Cold Case Love)
Skrillex
Sean Garrett (producer/song-writer)
Fernando Garibay (Lady Gaga’s Born This Way album)
Ester Dean (I’m pretty sure she’s working with Rih again)
Calvin Harris (I’m pretty sure he’s working with Rih again)
The Dream (Umbrella)
Hit-Boy (Cockiness)
The Runners (Cheers, California King Bed)
Da Internz (Birthday Cake)
Planet VI/Rock City (Man Down, Raining Men)
Diplo (DJ/producer)
deadmau5 (DJ/producer)
Jim Jonsin (Nelly’s Just A Dream, TI’s Whatever You Like)
Bonnie McKee (Part Of Me, Wide Awake)
Eric Bellinger (SOS, Beyonce’s Halo)
Kevin Cossom (song-writer)
Mikey Mike (song-writer)
Frank Romano (song-writer)
Justin Bieber (He wrote a song called “I Just Want To Be Loved” for Rihanna, LOL)
Rodney Jerkins (producer, supposedly working with Rih)
Nero (band/producers, supposedly working with Rih)
Red-One (producer)
Katy B (singer/song-writer, supposedly working with Rih)
Rico Love (song-writer, supposedly working with Rih)
Finatik N Zac (Australian producers, supposedly working with Rih)