One of the most important Brazilian vocal/instrumental groups of all time, MPB-4 always devoted its activities to MPB (a specific genre of Brazilian popular music employing sophisticated lyrics, melodies, and harmonies) where the commercial aspect was subordinat to the group's artistic standards. They reinvented the Brazilian vocal groups with their jazz free style focused on samba and also launched the careers of several soon-to-be masters of Brazilian music, such as Aldir Blanc (with his "Amigo É Pra Essas Coisas" with Sílvio da Silva Jr.). Having recorded more than 30 albums since 1964, many of them of utmost historical and artistic significance, they had a considerable part of this production released in countries like the U.S., Norway, Canada, Japan, Portugal, Mexico, Argentina, and others. The group was awarded with the Sharp prize as the best MPB group in 1987, 1989, and 1995. In 2001, MPB-4 completed a 36-year career with the same formation (registered in the Brazilian edition of the Guinness Book of Records of 1996).