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.
Advances granted between now and April 16 will be offered with no fees or interest of any kind for the next year.
The music veteran is currently undergoing treatment at the UCLA Medical Center.
The deal allows Apple Music to stream content owned and under license by all three major labels.
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