Ganga ire irai ne ne na gungiyar kada na kayan kida. A cikin tsarin rarraba Hornbostel-Sachs, wayar membrano ce.[1] Ganguna sun gunshi aqalla membrane guda daya, wanda ake kira digon ganga ko fatar ganga, wanda aka shimfida a kan harsashi kuma a buga, ko dai kai tsaye da hannun mai kunnawa, ko kuma tare da mallet, don samar da sauti. Yawancin lokaci akwai kan mai resonant a gefen ganga. An yi amfani da wasu dabaru don sa ganguna su yi sauti, kamar nadadden babban yatsan hannu. Ganguna su ne kayan kida mafi dadewa a duniya kuma mafi yawan kayan kida, kuma kirar asali ta kasance kusan ba ta canzawa tsawon dubban shekaru.[1]