Dick Van Dyke, who originated the role of Caractacus Potts in "Chitty Chitty Bang Bang," performed the movie's title tune at the D23 Expo Aug. 16. Van Dyke was joined by The Vantastix, an a cappella group started by Van Dyke and Mike Mendyke. 
SOURCE: Playbill at 01:46PM on August 25, 2015