baendeuga gasareul bakkugo noraereul yeonjuhaesseo.

A simple breakdown is:

• 밴드가 = the band / a band
  • subject marker 가
• 가사를 = lyrics
  • object marker 를
• 바꾸고 = change
  • -고, which links to the next action
• 노래를 = song
  • object marker 를
• 연주했어 = played / performed in casual past tense

The dictionary forms of the verbs are:

• 바꾸다 = to change
• 연주하다 = to play/perform music

They are particles that show each noun’s role in the sentence.

• 가 in 밴드가 marks the subject
• 를 in 가사를, 노래를 marks the direct object

So:

• 밴드가 = the band is the one doing the action
• 가사를 = the lyrics are what gets changed
• 노래를 = the song is what gets performed

English mostly uses word order to show this, but Korean uses particles very heavily.

-고 connects verbs and usually means and or and then.

So:

• 가사를 바꾸고 = changed the lyrics and...
• 노래를 연주했어 = performed the song

In this sentence, -고 most naturally suggests the band changed the lyrics and then performed the song.

It is a very common way to link actions in Korean.

In Korean, when actions are linked with -고, the tense is often shown only on the final verb.

So 바꾸고 연주했어 is understood as:

• changed the lyrics
• and performed the song

Even though 바꾸고 itself is not visibly marked as past, the whole sequence is interpreted in the past because the final verb is 연주했어.

If needed, Korean can mark the earlier verb too, but in a normal sentence like this, only the last verb usually carries the tense.

연주했어 is the casual past form of 연주하다.

Breakdown:

• 연주하다 = to perform/play music
• 연주해 = casual present
• 연주했어 = casual past

This comes from the common 하다 pattern:

• 하다 → 해
• 했다 / 했어 / 했어요 in the past

So 연주했어 means performed or played in an informal style.

했어 is an informal, casual ending.

Compare:

• 연주했어 = casual
• 연주했어요 = polite
• 연주했습니다 = formal

So this sentence sounds like something you would say:

• to a friend
• to someone younger
• in casual narration
• in diary-style writing

If you wanted to make it polite, you would say:

밴드가 가사를 바꾸고 노래를 연주했어요.

가사 usually means song lyrics as a whole, not just one single line.

So 가사를 바꾸다 means:

• to change the lyrics
• to alter the words of the song

If an English speaker sees 가사 and expects a singular/plural distinction like lyric vs lyrics, Korean does not work exactly the same way here. In this sentence, 가사 is best understood as the lyrics.

It is understandable, but depending on the situation, it may not be the most natural choice.

Why:

• 연주하다 is usually used for playing music, especially with instruments
• 노래 often makes people think of a song being sung

So native speakers might more often say:

• 곡을 연주하다 = to perform/play a musical piece
• 노래를 부르다 = to sing a song

That means:

• If the band performed the song instrumentally, 노래를 연주하다 can be understood
• If the band sang the song, 노래를 부르다 would usually sound more natural

So the sentence is not impossible, but the exact verb choice depends on what kind of performance is meant.

Korean usually follows Subject-Object-Verb order, while English usually prefers Subject-Verb-Object.

So in this sentence:

• 밴드가 = subject
• 가사를 = object
• 바꾸고 = verb
• 노래를 = object
• 연주했어 = final verb

A key Korean pattern is that verbs tend to come later, often at the end of the clause or sentence.

That is why Korean sentences can feel backward to English speakers at first.

Korean does not have articles like the and a/an.

So 밴드가 by itself could mean:

• the band
• a band

The exact meaning comes from context.

If the meaning shown to the learner says the band, that is a perfectly normal translation. But grammatically, Korean itself does not force that distinction here.

Yes. Korean often drops subjects when they are already clear from context.

So if everyone already knows you are talking about the band, you could simply say:

가사를 바꾸고 노래를 연주했어.

That would still be natural.

Korean is very context-dependent, so subjects and objects are often omitted when they are understood.