  developed and used by cultures living in forested areas, drums served as an early form of long distance communication, and were used during ceremonial and religious functions. == types == ===talking drum=== while this type of hour-glass shaped instrument can be modulated quite closely, its range is limited to a gathering or market-place, and it is primarily used in ceremonial settings. ceremonial functions could include dance, rituals, story-telling and communication of points of order. some of the groups of variations of the talking drum among west african ethnic groups: *tama (wolof of senegal) *gan gan, dun dun (yoruba of nigeria and eastern benin) *dondo (akan of central ghana and cote d'ivoire) *lunna (dagomba of northern ghana; mossi of burkina faso) *kalangu (hausa of northern nigeria, niger, northern ghana, benin and cameroon) *doodo (songhai and zarma of mali, burkina faso, and niger) in the 20th century the talking drums have become a part of popular music in west africa, especially in the music genres of jÃ¹jÃº (nigeria) and mbalax (senegal). === slit gongs === message drums, or more properly slit gongs, with hollow chambers and long narrow openings that resonate when struck, are larger all-wood instruments hollowed out from a single log. variations in the thickness of the walls would vary the tones when struck by heavy wooden drum sticks. while some were simple utilitarian pieces they could also be highly elaborate works of sculpture while still retaining their function. often there are small stands under each end of the drum to keep it off of the ground and let it vibrate more freely. these drums were made out of hollowed logs. they can also be made out of human bones. the bigger the log, the louder sound would be made and thus the farther it could be heard. a long slit would be cut in one side of the tree trunk. next, the log would be hollowed out through the slit, leaving lips (wooden ledges) on each side of the opening. a drum could be tuned to produce a lower note and a higher note. for that it would need to be hollowed out more under one lip than under the other. the drum's lips are hit with sticks, beating out rhythms of high and low notes. under ideal conditions, the sound can be understood at 3 to 7 miles,{{cite book|last=finnegan|first=ruth|title=oral literature in africa|year=2012|publisher=open book publishers|location=cambridge, uk|isbn=978-1-906924-72-0|page=470|url=https://unglue.it/work/81834/|quote="drum messages can be heard at
Drums History_of_telecommunications