Answer to Question 1
Middle East: The political boundaries of the Middle East encompass an area that runs from south of the Sudan in North Africa, through Israel to the top of Turkey in southwest Asia (sometimes called Asia Minor), and from Mauritania on the west coast of Africa through Afghanistan and Pakistan in southern Asia.
Arab World: The 22 nations where the Arabic language is spoken by the majority. See answer to question 1 above for list of all of the nations of the Arab world.
Muslim World: The religion of Islam is prominent throughout the Arab world and the Middle East; however, only about 20 of the world's Muslims (people of the Islamic religion) live in the Arab world, and the majority of Muslims live in South and Southeast Asia. In fact, Indonesia, Pakistan, India, and Bangladesh have the largest Muslim populations.
Answer to Question 2
Clarification of terminology: the Middle East, the Arab world, and the Muslim world
Listening to a call to prayer with a discussion of the relationship between music, spirituality, and Islamic practice, and the surrounding history
An interview with an Iraqi performer/composer and refugee in the U.S.
Music and history of the Western Arab world (maghrib): Jewish Sephardic music
Women's communal music-making in North African wedding rituals
Poetry in Arab culture: music and poetry and improvisation in both media
The music of Israel and the Palestinian territories; listening to music that highlights the roots and routes of Arab music
World coal reserves in gigatonnes
A Crab-eating Macaque, an old world species of monkey native to Southeast Asia
New Yorkers flee from the dust caused by the collapse of the twin towers of the World Trade Center f
World Religions
World population density
World Inequality and Its Components, 1820–1992