Camila Cabello didn’t have the highest of hopes for last month’s Grammy Awards. “No one really talks to each other at those things,” the pop singer said a few days before the ceremony.

For Camila Cabello, it always goes back to the music. The 25-year-old pop singer, known for hits “Havana,” “My Oh My” and “Bam Bam,” is joining the cast of NBC’s “The Voice” this ...