Tonearten endrer seg etter pausen.

Tonearten means the key in the musical sense, as in the key of a piece of music.

The ending -en is the Norwegian definite article attached to the noun. So:

• en toneart = a key
• tonearten = the key

This is very common in Norwegian: instead of putting a separate word like the before the noun, Norwegian usually adds the definiteness to the end of the noun.

Also, toneart is a compound noun:

• tone = tone
• art = kind/type

So toneart is literally something like tone-type, but in normal English it means key.

Because å endre seg means to change or to change itself/state, while å endre by itself usually means to change something.

Compare:

• Jeg endrer planen. = I change the plan.
• Planen endrer seg. = The plan changes.

So in your sentence:

• Tonearten endrer seg = The key changes

A very literal translation would be The key changes itself, but that sounds unnatural in English. In normal English, we simply say changes.

This use of seg is very common in Norwegian with verbs that describe something undergoing a change.

Seg is a reflexive pronoun. It can often correspond to oneself / itself / themselves, depending on the subject.

In this sentence, the subject is tonearten (singular), so seg refers back to tonearten.

Important point: seg does not change for singular/plural or gender in this kind of use. Norwegian uses the same form:

• Tonearten endrer seg. = The key changes.
• Toneartene endrer seg. = The keys change.

So seg here is part of the verb expression endre seg.

Endrer is the present tense of å endre.

• å endre = to change
• endrer = change / changes

So:

• Tonearten endrer seg = The key changes / is changing

In Norwegian, the present tense often covers both simple present and present progressive ideas, depending on context.

Etter pausen means after the pause.

Breakdown:

• etter = after
• pausen = the pause

So the phrase tells you when the change happens.

Because pausen is the definite singular form: the pause.

• en pause = a pause
• pausen = the pause

In this sentence, it sounds like a specific pause is meant, so Norwegian uses the definite form.

This is similar to tonearten:

• en toneart → tonearten
• en pause → pausen

This sentence uses normal Norwegian main-clause word order:

• Tonearten = subject
• endrer = verb
• seg = reflexive pronoun
• etter pausen = time phrase / adverbial phrase

So the structure is basically:

Subject + verb + other elements

That said, Norwegian is a V2 language, which means the finite verb normally comes in the second position in main clauses. If you move etter pausen to the front, the verb still stays second:

• Etter pausen endrer tonearten seg.

Not:

• Etter pausen tonearten endrer seg. ❌

That is a very common thing for English speakers to notice.

Usually toneart means key, not specifically key signature.

• toneart = key
• fortegn or toneartsfortegn can refer more specifically to key signature, depending on context

So The key changes after the pause is the safest translation.

In musical discussion, English sometimes uses key where learners might be tempted to say key signature, but they are not always the same thing.

Yes:

• Tonearten endrer seg etter pausen.
• Etter pausen endrer tonearten seg.

Both are correct.

The difference is mainly emphasis:

• Tonearten endrer seg etter pausen. = neutral statement
• Etter pausen endrer tonearten seg. = stronger focus on after the pause

When you move etter pausen to the front, remember the Norwegian V2 rule, so endrer must come right after it.

Mainly from the noun toneart.

In Norwegian, toneart is a musical term meaning key. Without context, many learners might not recognize it, but to a Norwegian speaker it strongly suggests music theory or a musical passage.

So the full sentence naturally reads as something like:

• The key changes after the pause
• or After the pause, the music changes key

depending on context.