Name The Year: Voltaire, thinker?

Questions

- Popularly known as a round, this is a never-ending canon which is also known as an infinite canon.?

(Lat., 'perpetually in motion') - A fast piece of music in which a rapid repetitive note-pattern is played throughout.?

(It.) - Heavy, ponderous.?

(Fr.) - Little .?

(It., 'chest') - In musical contexts used as in voci di petto, chest voice.?