I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "The organ was built by Harrison & Harrison in 1937, then with four manuals and 84 speaking stops, and was used for the first time at the coronation of King George VI. Some pipework from the previous Hill organ of 1848 was revoiced and incorporated in the new scheme. The two organ cases, designed in the late 19th century by John Loughborough Pearson, were re-instated and coloured in 1959."? 

Which happened first, the organ was built by Harrison & Harrison or the two organ cases were re-instated and colored?