لطفا صدای موسیقی را کم کن.

A careful pronunciation is:

lotfan sedâ-ye musiqi râ kam kon

A few notes:

• لطفا = lotfan
• صدای = sedâ-ye
• موسیقی = musiqi
• را = râ
• کم کن = kam kon

In everyday speech, را often becomes رو, so you may hear:

lotfan sedâ-ye musiqi ro kam kon

لطفا means please. It makes the command softer and more polite.

It often comes at the beginning of a sentence, as it does here, but Persian speakers can move it around depending on style and emphasis.

You may also see it written as لطفاً. That is the more formal spelling, but لطفا is very common too.

This is because of the ezafe linker, a very important Persian grammar feature.

• صدا = sound
• موسیقی = music
• صدای موسیقی = the sound of the music / the music’s sound

The -ye sound connects the two words. Since صدا ends in a vowel sound, the ezafe is written with ی, giving صدای.

So:

• صدا = sound
• صدای موسیقی = sound of the music

را marks the specific direct object.

In this sentence, the thing being affected is صدای موسیقی. The speaker is talking about a specific sound/volume, so Persian marks it with را.

A rough literal breakdown is:

• صدای موسیقی را = the sound of the music
• marked as the object of the verb

In spoken Persian, را is very often pronounced رو.

Persian usually follows Subject–Object–Verb order, while English usually uses Subject–Verb–Object.

So this sentence is structured more like:

Please + the sound of the music + object marker + lower/do

The verb comes at the end:

• کم کن = turn down / reduce

This verb-final pattern is one of the most important differences between Persian and English.

Yes, more or less. Persian often uses compound verbs.

Here:

• کم = less / low
• کردن = to do
• کم کردن = to reduce / to lower / to turn down

So کم کن is the imperative form of کم کردن, meaning reduce it, lower it, or in natural English, turn it down.

This pattern is very common in Persian. For example:

• باز کن = open it
• خاموش کن = turn it off
• تمیز کن = clean it

کن is the informal singular imperative of کردن.

It is used when speaking to:

• one person
• in an informal or familiar way

The subject you is not stated, because in commands it is usually understood.

So کم کن means:

• turn it down
• said to one person informally

It can be polite enough in the right situation, especially with a friend, sibling, child, or someone you speak to casually. لطفا softens the command.

But if you want to be more respectful or formal, you would usually say:

لطفاً صدای موسیقی را کم کنید.

Here, کنید is the formal/plural imperative.

So:

• کم کن = informal singular
• کم کنید = formal or plural

Because what is really being lowered is the sound/volume, not the music itself.

That is why صدای موسیقی is very natural: it clearly means the volume of the music.

That said, in casual speech Persian speakers may sometimes use shorter expressions if the meaning is obvious from context, such as:

• موسیقی رو کم کن
• صدا رو کم کن
• صداشو کم کن

But صدای موسیقی را کم کن is clear and natural.

In everyday speech, the most common changes are:

• را → رو
• the sentence may sound less formal overall

So a very natural spoken version is:

لطفاً صدای موسیقی رو کم کن.

Depending on the relationship between speakers, people might also say:

• صدای موسیقی رو کم کن
• میشه صدای موسیقی رو کم کنی؟

The last one is softer and less direct, more like Could you turn down the music?