Membranophones [2]

1. Struck membranophones [21]
   1. Directly struck [211]
   2. Shaken membranophones [212]
2. Plucked membranophones [22]
3. Friction membranophones [23]
   1. With stick [231]
   2. With cord [232]
   3. Hand friction [233]
4. Singing membranes [24]
   1. Free kazoos [241]
      • Paper on a comb
   2. Tube or vessel kazoos [242]
      • Eunuch flute
      • Kazoo