The Surdo is a large
bass drum used in many kinds of Brazilian music, most notably
samba. Surdo sizes normally vary between 16" or even 14" and 26" or even 29" diameter. In
Rio de Janeiro, surdos are generally 60cm deep. Surdos used in the
northeast of Brazil are commonly more shallow (50cm deep). Surdos may have shells of wood, galvanized steel, or aluminum. Heads may be goatskin or plastic. Rio baterias commonly use surdos that have skin heads (for rich tone) with aluminum shells (for lightness). Surdos are worn from a waist belt or shoulder strap, oriented with the heads roughly horizontal. The bottom head is not played.
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