The exact size, of course, depends on the playing time (in minutes and seconds), on how good the original compresses and the compression quality. 1 Mb a minute is a good approximation, in practice. I wouldn't trust 2 Gb to hold 1000 average downloaded songs. Just go for 4.
The causes of the Vietnam War were derived from the symptoms, components and consequences of the Cold War. The causes of the Vietnam War revolve around the simple belief held by America that communism was threatening to expand all over south-east Asia.
Devised by the Eisenhower administration, the domino theory stipulated that if one country succumbed to communism, the surrounding countries inevitably would fall as well. For this reason, the United States greatly increased its aid to the Republic of Vietnam. At first, American personnel consisted only of non-combatant advisors. In 1959, U.S. military advisors received permission to fire back if the enemy fired upon them.