Mi canción está en la cola de canciones del karaoke.

Because this sentence is talking about location/state, not identity.

• estar is used for where something is: Mi canción está en... = My song is in...
• ser is used for what something is: identity, origin, characteristics, etc.

So:

• Mi canción está en la cola... = it is located in the queue
• Mi canción es... would sound like you are defining what the song is, not where it is

This is one of the most common ser vs estar patterns to learn: use estar for location.

Here, cola means queue.

So la cola de canciones is the list/queue of songs waiting to be played or sung.

A useful thing to know is that cola can mean different things depending on context:

• queue / line
• tail
• sometimes glue

In this sentence, the context makes it clearly mean queue.

Also, in Spain, cola is a very normal word for queue. That fits well with the sentence.

Spanish often uses de where English uses a noun acting like an adjective.

English likes noun + noun combinations:

• song queue
• karaoke queue
• coffee cup

Spanish usually prefers:

• cola de canciones
• cola del karaoke
• taza de café

So la cola de canciones literally looks like the queue of songs, but that is the normal Spanish way to express song queue.

Because de + el contracts to del.

So:

• de + el = del
• a + el = al

That means:

• la cola de el karaoke → la cola del karaoke

This contraction is basically required in normal Spanish.

One important exception: If El is part of a proper name, you do not contract it.

For example:

• de El Escorial (not del Escorial, if you are treating El as part of the official name)

But with el karaoke, it contracts normally to del karaoke.

Because in Spanish it is usually treated as a masculine noun: el karaoke.

So you get:

• el karaoke
• del karaoke

Many borrowed words in Spanish get assigned a grammatical gender, and karaoke is commonly masculine.

Because mi already works like a determiner.

In Spanish, you normally do not use an article with a possessive adjective like mi, tu, su, etc.

So:

• mi canción = my song
• not la mi canción in standard modern Spanish

But cola is just a regular noun phrase here, so it needs its article:

• la cola

So the structure is:

• mi canción = possessive + noun
• la cola = article + noun

Because the queue contains multiple songs, not just one.

• canción = song
• canciones = songs

So la cola de canciones means the queue of songs.

If you said la cola de canción, that would sound wrong here, because the idea is a queue made up of many songs waiting their turn.

They have written accent marks to show the correct stress.

• canción is stressed on the last syllable: can-CIÓN
• está is stressed on the last syllable: es-TÁ

Without going too deep into spelling rules, the accents are there because otherwise the stress would be interpreted differently.

This is especially helpful for learners, because pronunciation and spelling are closely linked in Spanish.

Because en is the normal preposition for in / on / at in many location expressions.

Here it marks where the song is:

• está en la cola = is in the queue

Spanish en covers several English prepositions depending on context, so you cannot always translate it with just one word. In this sentence, in is the natural match.

Yes, very possibly.

That version would mean My song is in the karaoke queue.

The original sentence, la cola de canciones del karaoke, is a bit more explicit: it tells you this is the song queue of the karaoke.

Using la cola del karaoke may be enough if the context is already clear. For example, if everyone knows you are talking about the list of songs waiting to be sung, then the shorter version sounds natural.

So:

• la cola de canciones del karaoke = more explicit
• la cola del karaoke = shorter, often fine in context

Because Spanish and English often build noun phrases differently.

English often puts nouns before other nouns:

• karaoke song queue

Spanish usually builds that idea step by step with de:

• cola de canciones del karaoke

Literally, that is something like:

• queue of songs of the karaoke

That sounds heavy in English, but it is normal in Spanish.

So the word order is not random; it reflects a very common Spanish pattern: noun + de + noun.

No. It can also mean a queue in a more abstract or digital sense.

For example, you can talk about:

• a queue of people
• a queue of songs
• a print queue
• a waiting queue in a system

So in this sentence, cola works well for a list of songs waiting their turn.

It sounds perfectly natural for Spain, especially because cola is very common there for queue.

In other Spanish-speaking regions, people may choose different words depending on context. For example, some places use fila more for a line of people. But for Spain, cola is very standard.

So if you are learning Spanish from Spain, this is a good sentence to know.