The tourbillon system was made to compensate the Earth’s gravitational force by mounting the escapement in a revolving cage. It gives the watch a better accuracy. This complication is known as one of the most difficult to make.
Minute repeater watches ring whenever you activate the pusher (contrary to chimes). The most complicated ones can ring hours, quarters and minutes.
Watches featuring a « sonnerie » complication indicate the hour and quarters by means of hammers hitting bells or gongs which are tuned to different pitches. Chimes were originally made as a means of telling the time in the dark.