It’s no surprise that samba featured prominently at the Rio Olympics. But in the 100 years of Brazil’s iconic music form —the first song was registered in November 1916—samba has often struggled for respect. The singer-songwriter-novelist Chico Buarque remembers a critic who called him a sambista in a belittling way he took as an insult. When Carmen Miranda conquered Hollywood some Brazilians turned up their noses, at least in part because