Yeter ki tempo işaretini izleyelim, nakarata birlikte başlayacağız.

Yeter ki is a very common fixed expression meaning as long as, provided that, or sometimes if only depending on context.

In this sentence, it introduces the condition for what follows:

• Yeter ki tempo işaretini izleyelim = As long as we follow the tempo marking
• nakarata birlikte başlayacağız = we’ll start the chorus together

So here yeter ki is not about literal enough in the usual sense. It works as a set phrase that introduces a condition.

Yes, by itself izleyelim can mean let’s follow or let us follow.

But after yeter ki, this form often has a slightly different feel. It does not sound like a suggestion here. Instead, it expresses the condition in a natural Turkish way:

• Yeter ki ... izleyelim = As long as we follow ...
• not really Let’s follow ...

So grammatically it is the 1st person plural optative/jussive form, but in this structure it is best understood as part of the conditional meaning created by yeter ki.

Because izlemek takes a direct object, and here that object is definite: the tempo marking/sign.

So Turkish uses the accusative.

The base phrase is:

• tempo işareti = tempo marking / tempo sign

When it becomes a definite direct object, it changes to:

• tempo işaretini

This happens because tempo işareti is a noun compound, and compounds like this take the accusative with an extra -n- buffer:

• işareti
  • -ni → işaretini

This is the same pattern you see in forms like:

• kapı kolu → kapı kolunu
• otobüs durağı → otobüs durağını

That -i is not the accusative. It is part of the noun compound itself.

In Turkish, many noun compounds are formed like this:

• tempo işareti = tempo sign/marking
• literally something like its tempo-sign

The second noun often gets this compound marker, which looks like a 3rd person possessive ending.

So:

• tempo işareti = the basic compound
• tempo işaretini = the same compound in the accusative

This is why learners sometimes think there are two object markers, but there are not. One is part of the compound, and the other is the accusative.

Because başlamak usually goes with the dative case when it means to begin/start something in this intransitive pattern.

So Turkish says:

• işe başlamak = to start work
• derse başlamak = to start the lesson
• şarkıya başlamak = to start the song
• nakarata başlamak = to start the chorus

So nakarata is nakarat + dative -a, and it means to the chorus / into the chorus, which is how Turkish expresses start the chorus.

Because the speaker is talking about what will happen as a result of meeting the condition.

So the structure is:

• Yeter ki ... = As long as / provided that ...
• ... başlayacağız = we will start

The future here makes the main clause sound like a planned or expected result:

• As long as we follow the tempo marking, we’ll start the chorus together.

If a different tense were used, the nuance would change. For example, a present or aorist form could sound more general or habitual.

Turkish usually does not need subject pronouns when the verb ending already shows the subject.

Here the subject is built into the verb endings:

• izleyelim = let us / we should / we (in this context) follow
• başlayacağız = we will start

So biz is understood and does not need to be said.

If you added biz, it would usually be for emphasis:

• Yeter ki tempo işaretini izleyelim, biz nakarata birlikte başlayacağız.

But in normal speech, leaving it out is more natural.

Birlikte means together.

Here it modifies başlayacağız:

• nakarata birlikte başlayacağız = we will start the chorus together

Turkish word order is fairly flexible, so birlikte could appear in a few places without changing the basic meaning too much, for example:

• Nakarata birlikte başlayacağız.
• Birlikte nakarata başlayacağız.

The version in your sentence sounds natural and keeps the focus nicely on starting the chorus together.

Turkish often places the most important verb at the end of its clause, and modifiers usually come before what they relate to.

So this sentence is very normal Turkish:

• Yeter ki tempo işaretini izleyelim
• nakarata birlikte başlayacağız

A rough word-for-word order would feel more like:

• Provided that the tempo marking we follow, to-the-chorus together we-will-start

That sounds strange in English, but it is perfectly natural in Turkish.

The key thing is to read the sentence in chunks rather than word by word:

1. Yeter ki tempo işaretini izleyelim = the condition
2. nakarata birlikte başlayacağız = the result

Yes, a sentence with izlersek would also be possible in Turkish, but it would sound a little different.

Compare:

• Yeter ki tempo işaretini izleyelim
• Tempo işaretini izlersek...

The version with izlersek is a more straightforward if we follow structure.

The version with yeter ki ... izleyelim feels more like:

• as long as we follow
• provided that we follow
• the important thing is that we follow

So the original sentence has a slightly more idiomatic and natural emotional tone, especially in spoken or expressive Turkish.