In many African music cultures, there is a preference for "noikjkjkjksynoisy" [[timbre]]s. In some lamellaphones, for instance, metal rings are put around the lamellas to create a buzzing sound. Devices to create a buzzing sound also exist in string instruments. For example, on the enanga harp, scales of a kind of goana are fixed on the instrument in such a way that the vibrating strings will touch it. This gives a crackling timbre to the sound. Another example are membranes made from spider webs attached to the openings of calabash resonators in some types of xylophones. In singing, one can often also meet raspy or rough timbres very unlike the voice ideal of western music.
