Master Joe (Joel Hernández Rodríguez) and O.G. Black (Adolfo Ramírez Bruno) were a Puerto Rican reggaeton duo. They have released various albums and spawned moderate hits in Puerto Rico. They were part of DJ Joe's Escuadron Del Panico along with Hakeem & Jenay, Ranking Stone, Genio, Guayo Man, Doble Impact, Trebol Clan, and DJ Joe. Their hits include "Bailen Yackien", "Mi Locura (featuring Noriega)", "Mil Amores" and "Matadora". and As of 2007, they are no longer a duo. Master Joe duos with Lil' Sean. O.G. Black duos with Guayo Man. O.G. Black used to duo with Q Mac Daddy in the mid '90s and they released the CD Bajo Tu Observación. Are back recording big hits, many people do not have an idea of how much ahead of Daddy Yankee this duo were so hot in Playero. They record after Playero 38, a cd " el escuadrón del pánico" the cd was aim ay playero and mexican.( R.I.P) Mexican, tried to have a music battle! And he got it. Today they are taking their places again.