The deal also includes a publishing agreement with Capitol CMG.
Based in LA, Alonte will take up the newly-created role of SVP of Creative Integration (music).
After signing the paperwork back in December, the €3bn deal for a 10% stake has now closed.
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.
The deal was dubbed as 'a landmark day in the music industry'.
The app has over 36m subscribers and promotes mostly African artists.
The label is now worth over $300m, with Swift's masters accounting for 35% of the company's market share.