Who runs the Rio Carnival samba School parades?

A complicated question, on some levels.

Tickets for Rio Carnival 2010

Tickets are going on sale in the next couple of weeks. They will all be sold out in minutes, mostly to Cariocas (Rio locals) and agencies. As a tourist you are very unlikely to buy at these original face prices. Expect to buy from an agency with a mark-up of at least three times the face value. Its already possible to reserve tickets for the sambodromo through online agencies.

Original face values:( R$ = Brazilian Reals);Frisas (for 6 people) from R$3000 to R$6,500 per night,  Arquibancadas (stands or bleachers)- from R$110 to R$300 per night per seat.

I've heard a sneak preview of the Rio carnival official samba CD 2010 (Grupo Especial)  and it rocks!     Read more here