Le chant de Marie est magnifique.

Because chant is a masculine singular noun in French. French nouns have grammatical gender, so chant takes the masculine singular article le.

• le chant = the song / the singing
• If the noun were feminine, you would use la instead.

Here, de shows a relationship like of in English. In this sentence, de Marie means of Marie or, more naturally in English, Marie's.

So French often uses:

• le chant de Marie = Marie's singing/song

This is one of the most common ways French expresses possession.

Because Marie is a proper name, and proper names in French usually do not take an article in this kind of sentence.

So you say:

• de Marie

not:

• de la Marie
• de le Marie

In standard French, personal names normally appear without an article unless there is a special regional, informal, or stylistic reason.

Because du is a contraction of de + le. You only use du when de is followed by the masculine singular definite article le.

For example:

• de + le → du

But Marie is a name and does not use le here, so it stays:

• de Marie

not:

• du Marie

Chant can mean singing, song, or chant, depending on context.

In Le chant de Marie est magnifique, it most naturally suggests:

• Marie's singing is magnificent
• or Marie's song is magnificent

If the meaning has already been given to the learner, the key point is that chant is a noun, not a verb.

Est is the third-person singular form of the verb être (to be).

So:

• je suis = I am
• tu es = you are
• il/elle est = he/she is

In this sentence, the subject is Le chant de Marie, which is singular, so French uses est:

• Le chant de Marie est magnifique.

Because magnifique is an adjective used with the verb être. In French, when you describe something with être, the structure is:

• subject + être + adjective

So:

• Le chant de Marie = subject
• est = is
• magnifique = magnificent

This works very much like English:

• Marie's singing is magnificent.

Yes, adjectives normally agree in gender and number with the noun they describe. But magnifique is one of those adjectives whose masculine singular and feminine singular forms look the same.

So:

• un chant magnifique
• une voix magnifique

Both use magnifique in the singular.

The plural does change in spelling:

• magnifiques

So agreement still exists; it just is not visible here in the singular.

In this sentence, magnifique is not directly before or after the noun inside the noun phrase. It comes after the verb because it is part of the predicate:

• Le chant de Marie = the subject
• est magnifique = is magnificent

If you put the adjective directly with the noun, you would get:

• le magnifique chant de Marie

That is possible, but it sounds much more literary or emphatic. The normal, neutral sentence is:

• Le chant de Marie est magnifique.

Yes, but the meaning and structure are slightly different.

• Le chant de Marie est magnifique is a straightforward statement: Marie's singing is magnificent.
• Le chant de Marie, c’est magnifique is more like: Marie's singing — that’s magnificent.

The c’est version can sound a bit more emphatic or conversational. In a basic grammar sentence, est is the more direct and expected form.

Chant is pronounced roughly like shahn with a nasal vowel.

A few important points:

• ch in French is usually like sh in English
• the an in chant is a nasal sound
• the final t is normally silent

So it is not pronounced like English chant with a clear final t.

Yes. French very often uses de + noun/name where English uses 's.

Examples:

• le livre de Paul = Paul's book
• la voiture de ma sœur = my sister's car
• le chant de Marie = Marie's singing/song

So for English speakers, this is an important pattern to get used to: French usually prefers de rather than an apostrophe construction.