Vaya donde vaya, me gusta escuchar música para relajarme.

This is a very common Spanish pattern meaning wherever... or no matter where....

So Vaya donde vaya means wherever I go / no matter where I go.

Spanish often builds this idea by repeating the verb:

• Vaya donde vaya = wherever I go
• Haga lo que haga = whatever I do
• Diga lo que diga = whatever he/she/I say
• Pase lo que pase = whatever happens

So the repetition is not accidental; it is part of a set pattern.

Vaya is the present subjunctive of ir.

Here, the subjunctive is used because the sentence is talking about an indefinite, non-specific situation: not one particular place, but any place. That is why Spanish uses the subjunctive in this kind of wherever / whatever / whoever structure.

Compare the idea:

• Voy a Madrid = I am going to Madrid
• Vaya donde vaya = wherever I go

The second one is general and open-ended, so the subjunctive fits naturally.

No. Even though vaya can be a formal command in other contexts, that is not what it is here.

For example:

• Vaya al médico = Go to the doctor.
  Here vaya is a command to usted.

But in Vaya donde vaya, it is part of a subjunctive concessive structure, meaning wherever I go. So it is not telling anyone to go anywhere.

Spanish often leaves out subject pronouns when the meaning is clear from the verb or the context.

In this sentence, the understood subject is yo, because:

• me gusta = I like / it pleases me
• relajarme = to relax myself

So even though yo is not written, the whole sentence clearly refers to the speaker.

Spanish sounds more natural this way. Saying Yo vaya donde vaya... would sound wrong here.

Both can be possible with verbs of movement, because the idea is to whatever place I go.

• donde = where
• adonde = to where / where to

In practice, donde is very common and natural, including in Spain, even with movement verbs like ir.
So Vaya donde vaya sounds completely normal.

You may also see:

• Vaya adonde vaya

That version is a bit more explicit about movement and can sound slightly more formal or literary.

With gustar, the thing that is liked is actually the subject of the verb.

So me gusta escuchar música literally works like:

• Listening to music pleases me

The subject here is the whole infinitive phrase escuchar música, and Spanish treats that as singular, so it uses gusta.

Compare:

• Me gusta escuchar música = I like listening to music
• Me gustan las canciones tranquilas = I like calm songs

In the second sentence, las canciones tranquilas is plural, so you get gustan.

Because after gustar, Spanish normally uses an infinitive to talk about liking an activity.

So:

• Me gusta escuchar música = I like listening to music
• Me gusta leer = I like reading
• Me gusta viajar = I like travelling

Also, escuchar means to listen, which is more active and intentional than oír, which means to hear.

So escuchar música is the natural choice for listen to music.

Because para expresses purpose: in order to, so as to.

So:

• escuchar música para relajarme = to listen to music in order to relax

If you used por, the meaning would change. Por usually expresses ideas like because of, through, by, or for the sake of, not the intended goal in this sentence.

So here para is the correct preposition.

The verb is relajarse, a reflexive/pronominal form meaning to relax oneself or more naturally to relax / unwind.

When a reflexive pronoun goes with an infinitive, it is usually attached to the end:

• relajarme = to relax myself
• ducharme = to shower
• acostarme = to go to bed

So:

• para relajarme = in order to relax

You would not say para me relajar.

Yes. The comma is natural and standard here because Vaya donde vaya is an introductory clause before the main clause:

• Vaya donde vaya, me gusta escuchar música para relajarme.

It helps separate:

1. the introductory idea: wherever I go
2. the main statement: I like listening to music to relax

In normal writing, especially careful writing, that comma should be there.

Yes — very often. This is a productive pattern in Spanish.

Some very common examples are:

• Haga lo que haga = whatever I/he/she do/does
• Diga lo que diga = whatever I/he/she say(s)
• Sea como sea = however it may be / anyway
• Venga quien venga = whoever comes
• Esté donde esté = wherever he/she/I may be

It is a very useful pattern to learn because it appears a lot in real Spanish, including Spanish from Spain.