The media giant and Country Music trade association have pledged $10m and $1m, respectively.
The funds will be given as three $100,000 donations to two arts-related charities and a food bank in Las Vegas.
The former politician will officially take up the role in April, with plans to first tackle the COVID-19 fallout.
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.
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.