Die Vorband spielt live.

Because Vorband is a feminine noun in German, so its nominative singular article is die.

A good habit is to learn German nouns together with their article:

• die Vorband
• die Band

Since Vorband is based on die Band, it makes sense that it is feminine too.

German often forms new nouns by combining shorter words into one compound noun.
Here, Vor- means something like pre- or opening-, and Band means band.

So:

• Vorband = opening band

This is very normal in German. English often uses separate words where German uses one compound word.

Spielt is the third-person singular present tense form of spielen.

The verb spielen is conjugated like this in the present tense:

• ich spiele
• du spielst
• er/sie/es spielt
• wir spielen
• ihr spielt
• sie/Sie spielen

Since die Vorband is grammatically singular, the verb must also be singular:

• Die Vorband spielt live.

Because die Vorband is grammatically a singular noun, even though it refers to a group of people.

German usually makes the verb agree with the noun itself, not with the number of people inside the group.

So:

• Die Vorband spielt ... = singular
• Die Musiker spielen ... = plural

This is similar to English The band plays ... in standard singular usage.

Here, live is being used adverbially. It describes how the band plays.

So in this sentence, live does not change its form. It does not take adjective endings.

Compare:

• Die Vorband spielt live. = The opening band is playing live.
• eine Live-Band = here Live- is part of a noun phrase

In your sentence, live is simply an adverb-like expression.

Because the normal word order in a German main clause is:

subject + verb + other information

So:

• Die Vorband = subject
• spielt = finite verb
• live = adverbial information

German main clauses follow the verb-second rule, and this sentence fits that pattern perfectly:

1. Die Vorband
2. spielt
3. live

Yes, it can, if you want to emphasize it:

• Live spielt die Vorband.

This is grammatically possible because German allows different elements to come first, as long as the finite verb stays in second position.

But in normal everyday usage, Die Vorband spielt live. is the more neutral and natural version.

Yes, Vorband is a normal and useful word for an opening act in a concert context.

Depending on context, you might also hear:

• Support-Act
• Vorgruppe (less common in many contexts)
• Opener (in some informal usage)

But Vorband is a very straightforward and natural German word.

Because all German nouns are capitalized, and Vorband is a noun.

So in this sentence:

• Die = article
• Vorband = noun, therefore capitalized
• spielt = verb, not capitalized
• live = not a noun here, so not capitalized

This is one of the most noticeable spelling rules in German.