Play is to actor as concert is to which of the following in this analogy question.

Introduction / Context:
This analogy draws on knowledge of performers and performances. A play is a dramatic performance, and an actor is the person who performs in it. We must find the term that stands in a similar relation to concert, which is a musical performance. The question tests understanding of roles in performing arts and the distinction between performer, instrument and piece of music.

Given Data / Assumptions:

• First pair: Play : actor.
• A play is a theatrical work, and actors are the performers in that play.
• Second item: Concert : ?
• Options: Musician, percussion, symphony, piano.
• We assume ordinary meanings: concert is a live musical performance for an audience.

Concept / Approach:
The relationship is “performance type is to performer.” A play needs actors, and a concert needs musicians. Percussion is a section of instruments, symphony is a type of musical composition and piano is a specific instrument. Only musician represents the person who performs in a concert in the same way that an actor performs in a play. Therefore, musician is the parallel term completing the analogy.

Step-by-Step Solution:
Step 1: Rephrase the first pair: A play is performed by an actor. Step 2: Recognise that a concert is also a performance, but of music instead of drama. Step 3: Ask who performs in a concert. The answer is musicians, who sing or play instruments. Step 4: Evaluate options. Percussion, symphony and piano are related to music but are not people. Step 5: Choose musician as the only option that names a performer.

Verification / Alternative check:
We can verify by constructing parallel sentences: “An actor performs in a play” and “A musician performs in a concert.” These are grammatically and logically parallel, clearly linking performance to performer. Attempting to substitute other options gives mismatched relationships. For example, “A concert is to percussion” relates performance to an instrument group, which does not mirror play to actor. Similarly, symphony is content, not the performer, and piano is a single instrument, not the person playing it.

Why Other Options Are Wrong:

• Percussion: Refers to a family of musical instruments like drums and cymbals, not the human performer.
• Symphony: A large scale orchestral composition, which is a type of work performed in a concert, not the performer.
• Piano: A specific instrument, again not a person. It is something that musicians play.

Common Pitfalls:
Some candidates may confuse the type of performance with its content or instruments. A good strategy is to describe the relationship in the first pair clearly as “X is performed by Y” and then find a second pair that fits the same sentence structure. This approach quickly eliminates options that are objects or compositions instead of persons.

Final Answer:
The correct completion is Concert : Musician, giving the analogy Play : actor :: Concert : musician.