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.
The Vietnam War (also known as Second Indochina War or American War in Southeast Asia) lasted from 1955 to 1975. It was fought between North Vietnam and South Vietnam. North Vietnam was supported by the USSR, China and North Korea, while South Vietnam was supported by the United States, Thailand, Australia, New Zealand, and the Philippines. This conflict between communist and capitalist countries was part of the Cold War.