useless trivia: What Word Means: A Trickster - One That Duplicates?

Questions

The song Tonight We Love was taken from the opening theme of which concerto ?

In 1970, 100 cellists played Sardana in tribute to what composer ?

Who wrote the Skater's Waltz ?

Domenico Scarlatti's works are often identified with "L" and a number. Whatdoes "L" stand for ?

Who wrote most of Mozart's Symphony No. 37, K. 444 ?