Acoustic Guitar : An acoustic guitar is a guitar that uses only acoustic means to transmit the strings' vibrational energy to the air in order to produce a sound. Acoustic means not electric or not using electric impulses. The sound waves or an acoustic guitar are directed through the diaphragm of the guitar creating sound. This typically involves the use of a sound board and a sound box to amplify the vibrations of the string.
Drums : The drum is a member of the percussion group of musical instruments. In the Hornobostel-Sachs classification system, it is a membranophone.Drums consist of at least one membrane, called a drumhead or drum skin, that is stretched over a shell and struck, either directly with the player's hands, or with a drum stick, to produce sound. There is usually a resonance headon the underside of the drum, typically tuned to a slightly lower pitch than the top drumhead. Other techniques have been used to cause drums to make sound, such as the thumb roll.
Piano : It is widely used in classical and jazz music for solo performances, ensemble use, chamber music, accompaniment and for composing and rehearsal.