A bass drum used to mark the beat of samba music. For samba, the surdos are usually divided into 2 or 3 groups of different pitches.

Brazil; Samba; Instrument; Percussion; Drum. A low tom played with heavy mallets. Used to keep the beat in sambas. (th)

Brazilian bass drums used in mainly in samba music, worn around the neck and played with a beater in the right hand and open left hand strokes. A surdo gives a strong full bass tone.

Brazilian bass drum; referred to as the heart beat of the samba. The Bahia-style drum is of shallower construction than a Rio-style surdo. The head diameter is generally greater than the depth of the shell.

( soor du) is a Brazilian double headed bass drum carried in parades and played with a mallet and one hand, or two mallets. Surdos come in various sizes including 14 X 20 , 16 X 20 , 20 X 20 20 X 24 and 24 X 24. Surdos are made with a metal or thin wood shell and originally had goat skin heads. Plastic heads are common now and many groups from Bahia now put a layer of naugahide or split cowhide over the plastic, producing a more low end sound.

The Surdo is a large bass drum used in many kinds of Brazilian music, most notably samba.