Select the related word: Play is to Actor as Concert is to which of the following?

Introduction / Context:
This analogy connects a type of performance with the person who performs it. A play is a stage performance involving actors. You must now find the word that similarly names the person associated with a concert. Such role based analogies are straightforward but important in verbal reasoning tests.

Given Data / Assumptions:
1) A play is a dramatic performance presented on stage, usually by actors.
2) The word Actor refers to the person who performs roles in a play.
3) A concert is a public performance of music, either vocal, instrumental, or both.
4) The options are Symphony, Musician, Piano, and Percussion.
5) We need the word that names the person who performs in a concert, mirroring how Actor performs in a play.

Concept / Approach:
The model pair is Performance Type to Performer. A play is a kind of performance and an actor is the performer. For a concert, the people who perform are musicians. Symphony is a type of musical composition, piano is a musical instrument, and percussion is a family of instruments. None of those represent a person. Therefore, Musician is the correct match.

Step-by-Step Solution:
Step 1: Restate the original relation. A play is performed by actors. Step 2: Identify what kind of event a concert is. It is a musical performance. Step 3: Examine option a, Symphony. A symphony is a large scale musical composition, not a person. Step 4: Examine option b, Musician. A musician is someone who plays a musical instrument or sings, and is the person performing in a concert. Step 5: Examine option c, Piano. Piano is a musical instrument, not the performer. Step 6: Examine option d, Percussion. Percussion refers to a family of instruments like drums and cymbals, again not a performer. Step 7: Conclude that Musician is the only option that fits as the performer for a concert in the same way that Actor fits for a play.

Verification / Alternative check:
Write parallel sentences. A play is performed by an actor, and a concert is performed by a musician. Both are correct and show a consistent pattern. Saying a concert is performed by a piano or by a symphony is not accurate, because these refer to instruments or compositions rather than persons.

Why Other Options Are Wrong:
Symphony denotes a piece of music, piano denotes an instrument, and percussion denotes a class of instruments. None of these words name the person on stage. Since the analogy is clearly event to performer, these options fail to match the relationship correctly.

Common Pitfalls:
Sometimes test takers confuse the performance with its content and may see symphony as related to concert, but they overlook the pattern where the second word must be a performer. Checking whether the second word can grammatically follow is performed by clarifies that only musician fits properly.

Final Answer:
The correct completion of the analogy is Concert : Musician, just as Play : Actor.