The Dale Don Dale hitmaker was approached by producers at the CBS Radio-owned station El Zol to headline the show in Washington, D.C., but balked when he was asked to pay for his own transportation and hotel costs, and then submit the receipts as expenses for reimbursement at a later date.

Omar alleges there was no mention of the reimbursement in the $100,000 (£62,500) contract proposal he received, so he raised the complaint with CBS officials - only to be told days later that his services would no longer be required, according to legal documents filed in Maryland Federal Court on 11 May (15).

Omar goes on to claim that station chiefs used his name and likeness to promote the gig and secure event sponsors based on his appearance before he had even officially signed on. He is demanding damages for breach of contract and trademark infringement.