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.
Fourthly, Russian Declaration made another cause for the Cold War. Soviet Russia highlighted Communism in mass-media and encouraged the labour revolution. On the other hand, America helped the Capitalists against the Communism. So it helped to the growth of Cold War.