Il direttore coordina i tenori.

Because direttore starts with a normal consonant sound (d), so the masculine singular definite article is il.

A quick guide:

• il
  • most masculine singular nouns
    
    • il direttore
    • il libro

• lo

  • masculine singular nouns starting with:
  • z
  • s + consonant
  • ps
  • gn
  • x
  • y

  Examples:

• lo studente
• lo zio
• lo psicologo

So il direttore is the regular form.

Yes, direttore is masculine singular.

The feminine form is usually direttrice.

So:

• il direttore = the male director / conductor / manager
• la direttrice = the female director / conductor / manager

This is a useful pattern to notice:

• some masculine nouns ending in -tore form the feminine in -trice

For example:

• attore → attrice
• direttore → direttrice

Because coordina is the third-person singular present tense form of the verb coordinare.

Conjugation of coordinare in the present tense:

• io coordino = I coordinate
• tu coordini = you coordinate
• lui/lei coordina = he/she coordinates
• noi coordiniamo = we coordinate
• voi coordinate = you all coordinate
• loro coordinano = they coordinate

Since the subject is il direttore (the director), Italian uses the he/she/it form:

• Il direttore coordina = The director coordinates

Italian usually does not need subject pronouns when the verb ending already shows who is doing the action.

So instead of saying:

• Lui coordina i tenori

Italian normally says:

• Il direttore coordina i tenori

Or, if the subject is already understood:

• Coordina i tenori

You can use lui for emphasis or contrast, but it is not normally required.

Because tenori starts with a normal consonant sound (t), so the masculine plural definite article is i.

A quick comparison:

• i
  • most masculine plural nouns
    
    • i tenori
    • i libri
• gli
  • masculine plural nouns starting with:
    • vowel
    • z
    • s + consonant
    • ps
    • gn
    • x
    • y

Examples:

• gli studenti
• gli zii
• gli attori

So i tenori is correct.

Yes.

• tenore = singular
• tenori = plural

This is a common noun pattern in Italian:

• many nouns ending in -e form the plural in -i

Examples:

• il direttore → i direttori
• il tenore → i tenori

So in this sentence:

• il direttore = one director
• i tenori = more than one tenor

In this sentence, tenori means tenors, usually referring to singers with a tenor voice.

In music-related contexts:

• tenore can mean a tenor singer
• it can also refer more generally to the tenor voice type

So i tenori here most naturally means the tenor singers.

The normal word order is:

• Il direttore = subject
• coordina = verb
• i tenori = object

So the sentence follows the common Subject–Verb–Object pattern:

• Il direttore coordina i tenori.

That is the most neutral and natural order.

Italian can sometimes change word order for emphasis, but this basic order is the best one to learn first.

Not in normal everyday Italian.

The standard order is:

• Il direttore coordina i tenori.

Italian does allow some flexibility, but unusual word orders usually sound poetic, literary, or strongly emphatic. For a learner, it is best to keep the normal order:

• subject + verb + object

Because Italian uses definite articles more often than English does.

Here:

• il direttore = the director
• i tenori = the tenors

In Italian, it is very normal for both the subject noun and the object noun to have definite articles when they refer to specific people or groups.

So this structure is completely natural:

• Il direttore coordina i tenori.

A helpful pronunciation guide is:

• il direttore ≈ eel dee-ret-TO-reh
• coordina ≈ ko-or-DEE-na
• i tenori ≈ ee te-NO-ree

A few important points:

• Italian r is usually tapped or rolled.
• The double tt in direttore is pronounced more strongly and held a little longer than a single t.
• Final vowels are pronounced clearly:
  • -e
  • -a
  • -i

So try not to swallow the endings.

Usually yes, but like many words, the exact nuance depends on context.

Coordinare commonly means:

• to coordinate
• to organize in relation to other people or parts
• to direct activities so they work together

So Il direttore coordina i tenori suggests that the director is organizing or managing the tenors as a group.