What was Joni Mitchell's biggest commercial hit?

Eurodisco producer Giogio Moroder used the Moog synthesizers prominently on his records and collaborated with ________ on some of her biggest hits.

Fill in the blank(s) with the appropriate word(s).

Because Beethoven's piano music was lighter and more refined than that of Mozart, the Viennese piano was redesigned to be quieter in the early nineteenth century.

Answer the following statement true (T) or false (F)