Answer to Question 1
the riqq, the Arab tambourine with sensitive skin head and heavy cymbals (the jinglessmall metal disks--attached to the rim of the instrument)
Answer to Question 2
All of the musicians play the same melody, but not precisely in unison. Instead, each musician is free to add ornaments and nuances creating several different versions of the same melody at the same time. Some instruments leave notes out, while others double them. This musical texture is known as heterophony. (Also listen to CD 1:17, Amazing Grace in Chapter 4, another example of heterophony and read the accompanying discussion of the example.)
The plucked string instruments (ud, buzuq, and qanum) create a thicker, more sustained texture by double or quadruple picking (repeatedly picking a note) or fast tremolo (moving a finger or pick quickly up and down on a string), adding grace note pickups (playing short notes above or below just before the main note) and octave leaps (moving up and down an octave). The reed flute (nay) and violin can sustain their notes, vary the tone color (timbre) of those notes, or slide between notes. Each instrument decorates the melody with trills (rapidly moving up and down between two adjacent notes), turns (short notes above or below the main note), slides and variations in tone color that are characteristic of the particular instrument (see further discussion of this last variation in WOM).
Patient Position for Posterior Percussion
Andrea Palladio, Plan of main floor (piano nobile), Villa La Rotunda.
Identify the Main Term
Testing the patellar reflex with a percussion hammer.
Main Hall, Trajan's Market
Three Main Types of Tectonic Plates Boundaries