Misc: More than 75% of all the countries in the world are _____ of the equator?

Questions

- A composition for two performers sometimes with accompaniment. A piano duet is for two pianists on one piano.?

(It.) - A little duet.?

- Same as duet but mainly an instrumental composition for two performers. A piano duo is for two pianists on separate pianos.?

- Time in which the number of beats in the bar is divisible by two or four (e.g. 2 / 4, 4 / 4, 2 / 2).?

- A pair of notes occupying time usually taken by three (e.g. 6 / 8 or 3 / 8).?