useless trivia: What Word Means: A Dominican Stew?

Questions

Mozart borrowed the opening theme for "The Magic Flute" from the B-flat Sonata of what Italian-British composer ?

John Field was the first to use this title for a short piano piece in a romantic mood. Chopin acheived great success in developing this form. ?

The "G-string" in Bach's well-known Air refers to a string on what instrument ?

Tchaikowsky's "Marche Slave" is based on a folk-song of what national origin ?

Which pianist-composer permanently injured his hand by wearing a home-made contraption designed to immobilize the fourth finger while practising ?