How is sound produced in the following things?

1. The buzzing of mosquito
2. The sound of drums 
3. The sound of guitar 
4. The sound of trumpet

1. Vibration of mosquito wings produces buzzing sound.
2. The sound of drum is caused by the vibration of its membrane when struck by drumsticks.
3. The vibration of strings produces various sounds in guitar.
4. The vibration of air inside tube of the trumpet produces sound.