$75 trillion, not certain but likely more than the whole world's GDP.
If only they would retire on the proceeds of 1% of such a win, it might be worth giving it to them but these aren't people who are just in it for the money. They're also after control. If they retired then they wouldn't be in control of these music industry. That what really drives most of these mutlibillionaires after their first million or billion or whatever, the control they have over the resources and others.
Some of them will give portions or plan to give it all away to charity by the time they are dead but then they won't have to worry about being in control any longer, any way.