Here is the Alex's video which accompanies his talks

APRESENTAÇÃO DAS BATERIAS DAS ESCOLAS DE SAMBA DO GRUPO ESPECIAL DO RIO DE JANEIRO - 2011
- just what it says on the tin



And here is a great talk by Evelyn Glennie
Profoundly deaf since the age of twelve, she's become the leading solo concert percussionist

 

And some excellent and straightforward examples of common Samba drum patterns.