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 was a Cold War military conflict that occurred in Southeast Asia Vietnam, Laos, and Cambodia that began in 1959 and ended in April 1975. The war was between communist North Vietnam, supported by communist allies, and South Vietnam, bolstered by the US.