1. Chordophone
1.1. Sound is produced by vibrating strings
1.1.1. Bowed
1.1.1.1. Violin
1.1.1.2. Viola
1.1.1.3. Cello
1.1.1.4. Double bass
1.1.2. Plucked
1.1.2.1. Harpsichord
1.1.2.2. Guitar
1.1.2.3. Harp
1.1.3. Strike
1.1.3.1. Piano
2. Aerophone
2.1. Sound is produced by vibrating columns of air
2.1.1. Brass
2.1.1.1. Trumpet
2.1.1.2. Trombone
2.1.1.3. Tuba
2.1.2. Wood
2.1.2.1. Flute
2.1.2.2. Clarinet
2.1.2.3. Saxophone
2.1.2.4. Oboe
2.1.3. Free-reed
2.1.3.1. Sound is made by freely vibrating reed frame i.e. Accordion, harmonica etc
2.1.4. Free
2.1.4.1. Sound is made by column of air externalised from the instrument i.e. whip
3. Electrophone
3.1. Sound is produced by electronic means
3.1.1. Synthetically produced
3.1.1.1. Synthesizers
3.1.2. Electronic amplification
3.1.2.1. Electric bass
3.1.2.2. Electric guitar
3.1.2.3. Electric organ
4. Idiophone
4.1. Sound is produced by vibrating themselves
4.1.1. Concussion (Striking each other)
4.1.1.1. Castanets, Cymbals (the non drum kit kind)
4.1.2. Friction
4.1.2.1. Musical Glasses
4.1.3. Struck (Externalised striking)
4.1.3.1. Triangle, xylophone, vibraphone, bells, steel drums, cymbals (the drum kit kind)
4.1.4. Scraped
4.1.4.1. Washboard etc
4.1.5. Shaken
4.1.5.1. Maracas
5. Membranophone
5.1. Sound is produced by a vibrating membrane
5.1.1. Tubular (cylindrical, conical, hourglass, barrel)
5.1.1.1. Snare drum, kick drum etc.
5.1.2. Kettle drums (drum base is rounded)
5.1.2.1. Timpani
5.1.3. Friction drums
5.1.4. Mirlitons (vibration by voice or another instrument)
5.1.4.1. Kazoo
5.1.5. Frame drums
5.1.5.1. Tambourine