Serse tragedy and comedy or high and low class characters. The musicologist Charles Burney later took "Serse" to task for violating decorum in this way, writing: "I have not been able to discover the author of the words of this drama: but it is one of the worst Handel ever set to Music: for besides feeble writing, there is a mixture of tragic-comedy and buffoonery in it, which Apostolo Zeno and Metastasio had banished from serious opera." Another unusual aspect of "Serse" is the number of short, one-part arias, when a typical opera seria of Handel's time was almost wholly made
The Royal Opera were, according to the "Frankfurter Allgemeine Zeitung", "beside themselves with enthusiasm". In 1968, on the recommendation of the Home Secretary, James Callaghan, the Queen conferred the title "The Royal Opera" on the company. It was the third stage company in the UK to be so honoured, following the Royal Ballet and the Royal Shakespeare Company. Webster retired in June 1970. The music critic Charles Osborne wrote, "When he retired, he handed over to his successor an organization of which any opera house in the world might be proud. No memorial could be more appropriate". The successor was Webster's former assistant,