Montello, who takes over in January for Paul Pacifico, had been CEO of the Association for Electronic Music.
Yung Lean's 2013 hit "Ginseng Strip 2002" was the app's most-used song in 2022, boosting streaming and bringing a solid payday.
The live music business will be separate from MSG Networks, MSG Sphere and Tao Group Hospitality.
Apple Music Sing will be available later this month for all Apple Music users worldwide.
"Ginseng Strip 2002" ruled, while Mexican singer Kim Loiza enjoyed the most views of any artist account and more year-end takeaways.
Kayibi will look for investments and deals in both Anglophone and Francophone Africa.
The brand-new Moody Center in Austin tops the Billboard Boxscore year-end chart with multiple nights from big names, pent-up demand and the Irving Azoff effect.
Also this week: Guns N' Roses sue over literal guns and roses, the man who shot Lady Gaga’s dog walker is sentenced and much more.
The concert giant leads competitors by $2 billion in this year's Boxscore ranking.
The new count - discharging a firearm with gross negligence - came just days before testimony is set to begin in Los Angeles.
