In English vocabulary related to music and groups, a group of four people performing together is called what?

Introduction / Context:
Many general knowledge questions test your familiarity with specific English words used for groups, especially in music and performance. Words like 'duet', 'trio', and 'quartet' have precise meanings. This question focuses on the word used for a group of four performers, often singers or instrumentalists, who perform together as one unit.

Given Data / Assumptions:

We are given:
- Several group-related words: septet, quintet, hexet, quartet, trio.
- The question asks specifically about a group of four people.

Concept / Approach:
In Western music terminology:
- Duo or duet: 2 performers.
- Trio: 3 performers.
- Quartet: 4 performers.
- Quintet: 5 performers.
- Sextet (not 'hexet'): 6 performers.
- Septet: 7 performers.
Therefore, the correct word for a group of four performers is 'quartet'.

Step-by-Step Solution:
Step 1: Recall standard musical group names: duet, trio, quartet, etc.
Step 2: Match the number 4 with the correct term: quartet.
Step 3: Confirm that 'trio' corresponds to 3, 'quintet' to 5, and 'septet' to 7, so they cannot be correct.
Step 4: Note that 'hexet' in the options resembles 'sextet', which typically means 6, but the spelling is not standard.
Step 5: Choose 'Quartet' as the answer because it is the precise and widely used term for four performers.

Verification / Alternative check:
Music dictionaries, English vocabulary books, and even common usage in films and shows confirm that 'string quartet', 'vocal quartet', or 'jazz quartet' refer to groups of four musicians. This is consistent across different music traditions influenced by Western terminology.

Why Other Options Are Wrong:
- Septet: Used for a group of seven performers, not four.
- Quintet: Correctly refers to a group of five performers.
- Hexet: Not a standard term; the usual word is 'sextet' for six performers.
- Trio: This is a group of three performers, not four.

Common Pitfalls:
Some learners confuse 'quartet' with 'quintet' because both start with 'qui' or 'qua' sounds, and the numbers 4 and 5 are close. Another mistake is thinking 'trio' might mean any small group. To avoid confusion, remember the sequence: duo (2), trio (3), quartet (4), quintet (5), sextet (6), septet (7), octet (8). Memorizing this pattern helps in many GK and language questions.

Final Answer:
Correct option: Quartet