Final answer:
Percussion instruments where two similar objects are clapped together to produce a sound are classified as Idiophones in the study of music in world cultures.
Step-by-step explanation:
Percussion instruments where two similar objects are clapped together to produce a sound can be further classified under the Idiophones group. Idiophones are instruments that create sound primarily by the instrument as a whole vibrating, without the use of strings, membranes, or external air flow (as in the case of aerophones). An example of an idiophone is claves, instruments that consist of two sticks struck together. This classification system is used in ethnomusicology, which is the study of music in world cultures. According to this classification system, the four main types of musical instruments based on the way they produce sound are Aerophones (wind instruments), Chordophones (stringed instruments), Membranophones (instruments with a membrane, such as a drum), and Idiophones (self sounding instruments).