<Tr> <Th> Language </Th> <Td> English </Td> </Tr> <Tr> <Th> Box office </Th> <Td> $6 million </Td> </Tr> <P> If It's Tuesday, This Must Be Belgium is a 1969 DeLuxe Color romantic comedy film made by Wolper Pictures and released by United Artists . It was directed by Mel Stuart, filmed on location throughout Europe, and features many cameo appearances from various stars . The film starred Suzanne Pleshette, Ian McShane, Mildred Natwick, Murray Hamilton, Sandy Baron, Michael Constantine, Norman Fell, Peggy Cass, Marty Ingels, Pamela Britton, and Reva Rose . </P> <P> The title, also used by a 1965 documentary on CBS television that filmed one such tour, was taken from a New Yorker cartoon by Leonard Dove . Published in the June 22, 1957, issue of the magazine, the cartoon depicts a young woman near a tour bus and a campanile, frustratedly exclaiming "But if it's Tuesday, it has to be Siena," thereby humorously illustrating the whirlwind nature of European tour schedules . This concept formed the premise of the film's plot . Donovan sings "Lord of the Reedy River," which he had also written . He also wrote the film's title song, performed by J.P. Rags . J.P. Rags is a pseudonym for Douglas Cox . </P>

If this is thursday it must be belgium