This is the singer's second set of cancellations on this tour. Last week, he cancelled stops in New York and Maryland due to illness. A statement from the Chicago show's promoters, Live Nation said D'Angelo "expresses his sincere regret due to this unfortunate circumstance."

A publicist for the singer did not give details of the emergency, only revealing, "It's serious, but he should be OK," according to The Chicago Tribune.

D'Angelo has also cancelled two other upcoming shows including a stop in Minneapolis originally scheduled for last night (August 6) and another in San Diego on August 10.