MPB-4 (aka MPB4), is an important Brazilian vocal / instrumental group, which devoted its activities to MPB (where commercial aspects were subordinate 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