UnScramble this Word: a l i g n s i?

Questions

Who first published the admonition "please do not shoot the pianist.He is doing his best"?

What was the first name of Joplin, composer of "The Entertainer"and other rags?

What was Albert Ketelbey's real name?

Of these four great pianist-composers, which was the only one towrite operas?

Which composer was Norwegian?