Acronym Soup: DWPKOL ?

Questions

- Harmony in which notes of chords are written closely together (e.g. in barbershop quartets).?

- A 20th century concept of playing a group of adjacent notes simultaneously on the piano (e.g. with the forearm or a piece of wood. The usual term is tone cluster or note cluster. Pioneered by Cowell in 1912 and used by Ives.?

(It.,'tail') - The concluding section at the end of a movement, not usually of structural necessity. However, Beethoven's codas have great significance in his musical design.?

(It., 'little tail') - Similar to coda but on a smaller scale, eg. rounding off a section of a movement as opposed to a whole movement.?

(It.) - Agile and florid style of vocal performance.?