The drums used in ouled-ndaye music are large, barrel-shaped instruments stretched with animal skin. Each drum has its own low, booming voice, and when several drummers play together their rhythms interlock like puzzle pieces, creating a complex pattern that makes you want to move. Skilled drummers can vary the sound by striking different parts of the drum skin and by pressing with the palm of their hand to change the pitch.
The drumming is almost always combined with singing. Lead singers improvise verses about events, heroes, famous journeys and everyday life, while others join in with a repeated chorus. This call-and-response style — where one voice sings and others answer — is found in music traditions all across Africa and is thought to be one of humanity's oldest ways of making music together.
In nomadic communities of the Sahara, music has always been especially important because it can be carried without weight — unlike furniture or tools, songs travel easily on a journey. Drum traditions were also a way to send messages: different rhythms could tell listeners something had happened, a celebration was starting, or people should gather. The drums were like a wireless message system long before radio was invented.