Lydbildet er nytt.

The dictionary form is et lydbilde.

• et lydbilde = a sound image / a soundscape
• lydbildet = the sound image / the soundscape

This also shows that lydbilde is a neuter noun, because it takes et in the indefinite singular.

Because Norwegian usually writes compound nouns as a single word.

Here, lydbilde is made from:

• lyd = sound
• bilde = picture / image

So lydbilde literally looks like sound-image, but it functions as one noun. English often uses separate words where Norwegian prefers one compound.

In Norwegian, the definite article is often attached to the end of the noun instead of standing in front of it.

So:

• et lydbilde = a sound image / a soundscape
• lydbildet = the sound image / the soundscape

That -et is the definite ending for a neuter singular noun.

Because adjectives in Norwegian must agree with the noun.

The noun lydbilde is neuter singular, so the adjective ny changes to nytt.

Compare:

• en ny bil = a new car
• et nytt lydbilde = a new soundscape

So in Lydbildet er nytt, the form nytt matches the neuter noun lydbildet.

Because nytt here is a predicative adjective: it comes after er and describes the subject.

In Norwegian, adjectives behave differently depending on position:

• det nye lydbildet = adjective before the noun
• lydbildet er nytt = adjective after er

So:

• det nye lydbildet = the new soundscape
• lydbildet er nytt = the soundscape is new

Even though lydbildet is definite, the adjective after er is still nytt, not nye.

Er is the present tense of å være, which means to be.

So:

• jeg er = I am
• du er = you are
• det er = it is
• lydbildet er nytt = the soundscape is new

It works very much like English is in this sentence.

You would say:

Er lydbildet nytt?

Norwegian usually makes yes/no questions by putting the verb first:

• Statement: Lydbildet er nytt.
• Question: Er lydbildet nytt?

That word order is very common and important in Norwegian.

The hardest part for many English speakers is the vowel y.

A useful way to think about it:

• Start with an ee sound
• Round your lips as if saying oo

That gives you something close to Norwegian y.

A few pronunciation notes:

• nytt has a short vowel
• the double tt helps show that the vowel is short
• it sounds roughly like nyt, but with the Norwegian y sound, not the English i in bit

So nytt is not pronounced like English night or nit.

Yes. That is the indefinite version.

• Et nytt lydbilde = a new soundscape
• Lydbildet er nytt = the soundscape is new

The first is a noun phrase.
The second is a full sentence.

This is a very useful contrast to learn:

• et nytt lydbilde
• lydbildet
• lydbildet er nytt