Usher is suing his longtime collaborator Bryan-Michael Cox and several business partners over an unpaid $700,000 balance from a $1.7 million loan intended for a Buckhead restaurant project that never materialized. Usher, who has worked with Cox on classics like Burn and U Got It Bad, is now seeking up to $4.9 million in damages after court documents allege the loan money was misused rather than applied to the property purchase as agreed.