Questions 67 & 68

Chicago, performing in Paris in 1969. "Questions 67 & 68" was the first single from their first album, Chicago Transit Authority, which was the band's name until they became well-known and they had to shorten it because the actual Chicago Transit Authority threatened litigation. The song was only a minor hit in 1969, but when it was re-released in 1971, it did much better. 

Update: Chicago also released a version of the song in Japanese in 1971. Hear it performed in 1995 at Laughing Squid.