A koncerten az élőzene és a jó hangulat miatt izgatott vagyok.

Koncerten is koncert + the location/event suffix -on/-en/-ön.

Here it means at the concert. In Hungarian, this suffix is often used not only for physical surfaces, but also for events:

• a koncerten = at the concert
• az órán = in class / at the lesson
• a találkozón = at the meeting

So even though English uses at, Hungarian uses this case ending.

Because Hungarian treats many events as something you are at, using -on/-en/-ön, not -ban/-ben.

• koncerten = at the concert
• koncertben would sound unnatural here

A useful idea is:

• -ban/-ben = in(side) something
• -on/-en/-ön = on / at, and often at an event

So for concerts, classes, meetings, performances, Hungarian very often uses -on/-en/-ön.

They are the same definite article, just with two forms:

• a before a consonant
• az before a vowel

So:

• a koncerten because koncerten starts with k
• az élőzene because élőzene starts with é
• a jó hangulat because jó starts with j

This is similar to English a/an, but Hungarian uses it for the definite article instead.

Because élőzene begins with a vowel sound, so the definite article becomes az.

Also, élőzene means live music as a single lexical unit. Hungarian often writes such combinations as one word when they function as a set expression or compound noun.

So:

• élőzene = live music
• az élőzene = the live music

Miatt means because of, due to, or on account of.

It comes after the noun phrase because it is a postposition. English uses prepositions, which go before:

• English: because of the live music
• Hungarian: az élőzene miatt

In your sentence, it follows the whole coordinated phrase:

• az élőzene és a jó hangulat miatt = because of the live music and the good atmosphere

So Hungarian says the reason first, then puts miatt after it.

Because in Hungarian, when two definite nouns are joined with és (and), it is very normal to repeat the article before each one:

• az élőzene és a jó hangulat

This sounds natural and clear. English often uses just one the, but Hungarian commonly keeps the article with each coordinated noun phrase.

You may sometimes see article omission in other contexts, but here the repeated articles are the most natural standard form.

Because vagyok is the 1st person singular form of van (to be), meaning I am.

• izgatott = excited
• izgatott vagyok = I am excited

Hungarian needs the verb here because the subject is I.

A useful contrast:

• Én izgatott vagyok. = I am excited.
• Ő izgatott. = He/She is excited.

In the 3rd person singular present, Hungarian usually leaves out the verb van in sentences like this, but in 1st person singular, you do need vagyok.

Because Hungarian usually leaves out subject pronouns when the verb already shows the person.

Here, vagyok already means I am, so I is understood.

• izgatott vagyok = I am excited

You could add én for emphasis:

• Én izgatott vagyok. = I am excited.

But without emphasis, Hungarian normally omits it.

Not always. Izgatott can mean:

• excited
• worked up
• agitated
• nervous/excited

The exact feeling depends on context.

In a sentence about a concert, izgatott vagyok will usually be understood as I’m excited in a positive sense. But in another context, it could sound more like agitated or nervously excited.

If you want a clearly positive word, Hungarian also has words like:

• lelkes = enthusiastic
• nagyon várom = I’m really looking forward to it

Because Hungarian word order is flexible, and the beginning often gives the topic or setting.

So A koncerten sets the scene first:

• At the concert, ...

Then the sentence says how you feel and why.

This is very natural in Hungarian. The sentence is basically organized like this:

• Setting/topic: A koncerten
• Reason: az élőzene és a jó hangulat miatt
• Main statement: izgatott vagyok

You can move parts around in Hungarian, but that changes emphasis and information flow.

Yes, but you would need a different structure.

• miatt is used with a noun phrase
• mert introduces a clause

Your sentence uses a noun phrase:

• az élőzene és a jó hangulat miatt

If you want mert, you would say something like:

• Izgatott vagyok, mert élőzene van és jó a hangulat.

So both can express a reason, but they are not interchangeable word-for-word.

Because izgatott vagyok is the normal neutral order for this kind of statement.

In Hungarian, predicate expressions often come before the form of to be:

• boldog vagyok = I am happy
• fáradt vagyok = I am tired
• izgatott vagyok = I am excited

You may sometimes hear other orders for emphasis or style, but izgatott vagyok is the standard, natural form here.