Héctor Lavoe a guest singer with the Fania All-Stars for several shows. One of the group's notable performances took place in the Kinshasa province of the Zaire (modern day Democratic Republic of Congo) where the group performed as part of the activities promoting The Rumble in the Jungle, a boxing fight between Muhammad Ali and George Foreman for the heavyweight championships of the World Boxing Council and World Boxing Association. The Fania All Stars recorded several of their tracks during live concerts. Lavoe was part of the group when the All-Stars returned to Yankee Stadium in 1975, where the band recorded a
George Foreman by the WBA and WBC. In 1972, still undefeated and with an impressive knockout record, Foreman was set to challenge undefeated and Undisputed World Heavyweight Champion Joe Frazier. Despite boycotting a title elimination caused by the vacancy resulting from the championship being stripped from Muhammad Ali, Frazier had won the title from Jimmy Ellis and defended his title four times since, including a 15-round unanimous decision over the previously unbeaten Ali in 1971 after Ali had beaten Oscar Bonavena and Jerry Quarry. Despite Foreman's superior size and reach, he was not expected to beat Frazier and was a 3:1 underdog