By Felicity Clarke, Senior Reporter
RIO DE JANEIRO - The build up rumble of drums that will culminate in Carnival is well under way, as Rio's streets become the venue for the exhilarating samba rhythms pounded out by the city's "blocos". Blocos are the musical street parades that for some, are a fun alternative to paying the high prices of watching Carnival in the Sambodromo, or for those who just enjoy the weeks of pre-parties, that defines the Carnival experience.
The biggest bloco is reportedly the . . .