Macklemore and Ryan Lewis ‘White Walls’ Video
It features the hook sung by multi-talented Seattle artist Hollis Wong-Wear. She's a poet, songwriter and signer who's part of the group The Flavr and and done solo work. She also is a tour manager, video producer and hooked Macklemore and Ryan Lewis up with Mary Lambert, who sang on Same Love.
Schoolboy Q is the other guy dropping a verse. Also keep an out out for Sir Mix A Lot!