Das Line-up enthält den Headliner.

Line-up is a loanword from English, and in German many borrowed nouns of this type are treated as neuter, so you say das Line-up.

There is not always a perfect rule for gender with loanwords, so in practice you often just have to learn the article together with the noun:

• das Line-up
• der Headliner

A good habit is to memorize new nouns as full units, not by themselves.

Because it comes from the verb enthalten, and this verb changes its stem vowel in the 3rd person singular present tense.

So:

• ich enthalte
• du enthältst
• er/sie/es enthält

This is similar to other strong verbs in German, for example:

• halten → er hält
• fahren → er fährt
• laufen → er läuft

So enthält is just the correct present-tense form for das Line-up.

Because Headliner is the direct object of the sentence, and it is masculine.

The verb enthalten takes an accusative object, so:

• nominative: der Headliner
• accusative: den Headliner

In this sentence:

• Das Line-up = subject
• enthält = verb
• den Headliner = direct object

Since Headliner is masculine and in the accusative case, der changes to den.

The articles help you.

In Das Line-up enthält den Headliner:

• das Line-up is nominative, so it is the subject
• den Headliner is accusative, so it is the object

English usually relies more on word order, but German often gives you extra clues through case marking.

That is especially useful because German word order can change more than English word order.

Yes. This is a very standard sentence pattern:

Subject + verb + object

So:

• Das Line-up = subject
• enthält = verb
• den Headliner = object

This is the most neutral way to say it.

German can also move elements around for emphasis, for example:

• Den Headliner enthält das Line-up.

That is grammatically possible, but much less neutral and more marked in tone.

Yes. Both are common in areas like music, festivals, concerts, and entertainment.

German often keeps English terms in these contexts, especially in marketing, pop culture, and event language. So a sentence like this sounds quite natural in the right context.

That said, the exact style can vary:

• Line-up is very common for a festival or concert roster
• Headliner is also very common for the main act

Because in German, all nouns are capitalized.

So even though Line-up comes from English, once it is used as a German noun, it follows German capitalization rules:

• das Line-up
• der Headliner

This is one of the most noticeable differences from English writing.

The dictionary forms are:

• das Line-up
• enthalten
• der Headliner

That is how you would usually look them up.

It is useful to learn nouns with their articles and verbs in the infinitive:

• noun: das Line-up
• verb: enthalten
• noun: der Headliner

Usually:

• singular: das Line-up
• plural: die Line-ups

And:

• singular: der Headliner
• plural: die Headliner

So Headliner often stays the same in the plural, while Line-up usually takes -s, which is common with many loanwords in German.

Examples:

• Die Line-ups enthalten mehrere bekannte Namen.
• Die Headliner spielen am Samstagabend.

Yes, but it sounds a bit neutral or factual.

enthalten often means to contain or to include, and it is common in both formal and everyday German.

In event language, this sentence sounds fine. But depending on context, Germans might also say things like:

• Im Line-up ist der Headliner dabei.
• Das Line-up umfasst den Headliner.

So enthält is correct and natural, but it has a slightly informational tone.

Only the article would change according to gender and case.

Accusative articles:

• masculine: den
• feminine: die
• neuter: das

So compare:

• Das Line-up enthält den Headliner.
• Das Line-up enthält die Band.
• Das Line-up enthält das Duo.

This is a good example of why German articles are so important: they show both gender and sometimes case.