Todos corearon la versión acústica.

Corearon comes from the verb corear.

In music contexts, corear usually means:

• to chant
• to sing along
• to join in vocally
• to chant in unison

So it is not exactly the same as cantaron.

• cantaron = they sang
• corearon = they joined in singing/chanting, often together as a group

That makes corearon a very natural verb if a crowd or audience is repeating or singing part of a song together.

Corearon is:

• preterite tense
• 3rd person plural
• from the infinitive corear

So it means they chanted / they sang along / everyone joined in as a completed action in the past.

A quick breakdown:

• yo coreé
• tú coreaste
• él/ella coreó
• nosotros coreamos
• vosotros coreasteis
• ellos/ellas/ustedes corearon

The preterite is used because the sentence presents the action as a finished event.

Todos literally means all or all of them, but in many contexts it is naturally translated as everyone.

In this sentence, Todos is the subject, so it means something like:

• everyone
• they all
• all of them

If the group is mixed or unspecified, Spanish normally uses the masculine plural form todos.

If the group were all female, you could say:

• Todas corearon la versión acústica.

Spanish generally uses the definite article more regularly than English.

Here, la versión acústica means the acoustic version:

• la = the
• versión = version
• acústica = acoustic

The article is needed because versión acústica is a specific noun phrase functioning as the direct object of the verb.

So:

• Todos corearon la versión acústica.
• literally: Everyone sang along to the acoustic version.

Without la, the sentence would usually sound incomplete or unnatural in standard Spanish.

In Spanish, adjectives often come after the noun.

So:

• versión acústica = acoustic version

This is the most normal word order here:

• noun: versión
• adjective: acústica

Putting the adjective before the noun is sometimes possible in Spanish, but it often changes the tone, emphasis, or naturalness. In this case, la acústica versión would sound unusual.

Because adjectives in Spanish must agree with the noun they describe in gender and number.

Here:

• versión is feminine singular
• so the adjective must also be feminine singular
• therefore: acústica

Compare:

• el concierto acústico → masculine singular
• la versión acústica → feminine singular
• los conciertos acústicos → masculine plural
• las versiones acústicas → feminine plural

Versión has a written accent because of Spanish stress rules.

Without the accent, version would normally be stressed on the second-to-last syllable because it ends in n.

But the correct pronunciation stresses the last syllable:

• ver-sión

So the accent mark shows that the stress is irregular for that spelling.

This is very common with words ending in:

• -ión
• -ón

Examples:

• canción
• versión
• emoción

Because it already follows the normal stress rules of Spanish.

Corearon ends in n, so by default the stress falls on the second-to-last syllable:

• co-re-a-ron

That is the correct pronunciation, so no written accent is needed.

This also means the vowel sequence is pronounced clearly:

• co-re-a-ron not as one compressed syllable.

Yes, the vowels are pronounced separately enough to hear the sequence clearly:

co-re-a-ron

A useful approximate pronunciation is:

• ko-reh-ah-ROHN

The stress is on a:

• co-re-A-ron

For an English speaker, the main thing is not to reduce it too much. Try to keep the vowels audible instead of turning it into something like one blurred syllable in the middle.

It can be used in both music and non-music contexts.

Common uses include:

• a crowd chanting a slogan
• fans singing along with a song
• an audience joining in with a repeated phrase

So in a concert context, corear is very natural.
In a sports or protest context, it can also mean to chant.

That is why it is a useful verb to learn: it often suggests a group voice, not just ordinary singing.

Yes. You could say:

• Todo el mundo coreó la versión acústica.

That means everyone sang along to the acoustic version.

The difference is mainly grammatical style:

• Todos corearon... = everyone / they all...
• Todo el mundo coreó... = everyone / literally: all the world...

Notice the verb changes:

• Todos corearon → plural subject
• Todo el mundo coreó → singular expression, so singular verb

Both are correct, but todos sounds a bit more direct and compact.

Because la versión acústica is a direct object, and it is a thing, not a person.

Spanish uses the personal a mainly before specific human direct objects.

Compare:

• Vieron a María. → person, so a
• Corearon la versión acústica. → thing, so no a

So the absence of a here is exactly what you would expect.

Yes. It sounds natural and clear in Spain.

It is a normal sentence structure:

• subject: Todos
• verb: corearon
• object: la versión acústica

And both corear and versión acústica are standard, natural choices in a musical context.