#ChatGPT doesn't have all databases in its mind, but it thinks it does and sometimes can say real facts as if it does. (If it knows the current president in 1996, does it have a database of all world leaders for all years for all time? No.)
If it knows a short song up-tempo song does it have an internal database of all songs and their tempo & lengths? No, what little it knows probably came from reading music reviews, not a database.