Sheet music became commonplace in homes starting about 1840. Postcards came along some years later, but when the songwriters put their pens to a score postcards and music were a perfect match.
If a social maxim ever develops proposing that the NEW YORK SPORTS WORLD ≠ NEW YORK CIVIL WORLD don’t bet on it. These worlds exist in a sinuous simultaneousness and have a well-developed synchronicity. Yeah? I think so too!