Son by 4

Son by Four is a salsa music group from Puerto Rico, well known for their English U.S. pop hit "Purest of Pain (A Puro Dolor)". The group is now an independent band. They founded their own label SB4 Music Group on 2003.

Son by Four was created by Panamanian producer and songwriter Omar Alfanno and integrated by Ángel López, Pedro Quiles, and brothers Javier Montes and George Montes.

From Wikipedia

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