1. How do instruments create sound?
   1. Air
      1. Blow
   2. Hit / Shake / Scrape
   3. Electronic
      1. Keyboards
      2. Synthesisers
   4. String
2. Classification of Instruments
   1. String
      1. Guitar
      2. Violin
         1. small
      3. Viola
         1. a little bigger than the violin
      4. Ukelele
      5. Harp
      6. Cello
         1. large
      7. Double Bass (Contra Bass)
         1. Giant
      8. Banjo
      9. Electric bass guitar
   2. Percussion (hit / shake / scrape)
      1. Tuned Percussion
         1. Glockenspiel
         2. Piano (also string)
         3. Timpani
            1. Kettle Drum
         4. Vibraphone
         5. Xylophone
         6. Marimba
         7. Celeste
      2. Untuned Percussion
         1. Hit
            1. Tambourine
            2. Triangle
            3. Drum
            4. Bongos
            5. Congas
            6. Clapping Sticks
            7. Clave
            8. Cymbal
            9. Gong
         2. Shake
            1. Tambourine
            2. Maracas
            3. Castanets (also hit)
         3. Scrape
            1. Guiro
            2. Cabasa
   3. Woodwind
      1. Flute
      2. Clarinet
      3. Recorder
      4. Saxophone
      5. Bassoon
   4. Brass
      1. Trumpet
      2. Trombone
      3. Tuba
      4. French Horn