Sales were down 29% the week ending March 19 - the lowest in US history.
Musicians who have had work canceled can apply now for rent and mortgage assistance through the growing fund.
The deal is expected to closed in the second quarter of 2020.
Revenue from film music, which makes up 80% of IMI members revenue, has come to a halt.
The African streaming giant has seen a recent increase in streaming and subscription activity.
The letter, sent today, was also signed by Anderson .Paak, Gwen Stefani, and Tim McGraw.
The new decision could potentially be reversed, pending another appeal.
This represents the largest amount of yearly revenue generated since 2006.