Both times I got married it was at City Hall by the clerk, so there wasn't any music. In 1972 I was stationed in Savannah, Georgia in the Army and a fellow I worked with was getting married and asked what's a good song for his wedding. I said 'Colour My World" by Chicago. He agreed and they used my record to play at the wedding.
About 1975 out of the Army and living in St. Petersburg a neighbor asked me the same question. I again recommended 'Colour My World' and they agreed and also used my record. I was at both weddings and the song was great and is just the right speed for the march. I didn't see the song listed on your Australian website, I guess times change.
Chicago - Colour my world - YouTube