From what I've seen at concerts in the past Jamiroquai don't look to have unreasonable requests for food/refreshments and this is (sort of) confirmed in an story at the Serbian website blic.rs.

Along with a crew of 26 people on-stage the band request "top quality French wine, champagne, as well as French beer Kronenbourg."

More details of the bands requests can be found at the blic.rs website.