So being a bored engineer, the US has approximately 311 million people * 4.66 / 100k = 14,492 heavy metal bands in the USA
Sweden and Finland combined has 14 million * 53.2 / 100k = 7,448 bands.
Poor little china only has .41 bands per 100k, but with their 1.3 billion population, that's 5,330 heavy metal bands
and India's .01 with their 1.1 billion population would make for 110 bands!!!!