The DownBeat Blindfold Test is one of the most enjoyable permanent features in the American jazz magazine DownBeat. Well-known jazz musicians listen to jazz pieces without knowing who is playing or what the recordings are. They are then questioned about the title of the piece, the band members, the soloists, the period and other facts. Dee Dee Bridgewater will undergo the DownBeat Blindfold Test, live at the North Sea Jazz Festival on Saturday July 11 from 10.15 to 11.15 p.m.