Il ritornello sembra stonato.

Ritornello usually means chorus or refrain in a song.

In music-related Italian, it is the part that comes back repeatedly. In some contexts, it can also mean a repeated phrase or refrain in a more figurative sense.

In this sentence, il ritornello = the chorus.

Italian often uses the definite article where English may or may not use it.

Here, il means the, so il ritornello = the chorus.

The noun ritornello is:

• masculine
• singular

So it takes il, the regular masculine singular definite article used before most consonants.

Sembra means seems.

It comes from the verb sembrare = to seem.

So:

• sembra = it seems
• il ritornello sembra stonato = the chorus seems out of tune

Grammatically, sembra is third person singular, because the subject il ritornello is singular.

There is an important difference:

• è stonato = is out of tune
• sembra stonato = seems out of tune

Sembra makes the statement a little less direct or less absolute. It suggests an impression rather than a flat fact.

So:

• Il ritornello è stonato = the speaker states it as a fact
• Il ritornello sembra stonato = the speaker says that it sounds or appears that way

Stonato means out of tune, off-key, or sometimes more broadly discordant.

It comes from stonare, which is related to being off pitch or not harmonizing properly.

In music, it commonly describes:

• a singer
• an instrument
• a note
• a passage of music

So in this sentence, stonato describes the ritornello as sounding musically wrong or off.

Because ritornello is a masculine singular noun, the adjective must agree with it.

Agreement:

• ritornello → masculine singular
• stonato → masculine singular

Compare:

• Il ritornello sembra stonato.
• La melodia sembra stonata.

So the ending changes to match the noun it describes.

No. It is very common in music, but it can also be used more figuratively.

Literal use:

• cantare stonato = to sing out of tune
• una chitarra stonata = an out-of-tune guitar

Figurative use:

• something that feels out of place
• something that does not fit the context

So depending on context, stonato can mean both:

• musically off-key
• socially or stylistically out of place

Yes, you can, but it is slightly different.

• sembra stonato = seems out of tune
• suona stonato = sounds out of tune

Both are natural, but suona stonato focuses more directly on how it sounds, while sembra stonato can feel a little more observational or cautious.

Because in Italian, the subject is already expressed by il ritornello.

English says:

• The chorus seems out of tune

Italian says:

• Il ritornello sembra stonato

There is no need for an extra pronoun like it, because il ritornello is already the subject of the verb.

The word order is very standard:

• Il ritornello = subject
• sembra = verb
• stonato = adjective/complement

So the structure is:

Subject + verb + adjective

This is one of the most common and neutral patterns in Italian.

A simple English-friendly guide:

• ritornello ≈ ree-tor-NEL-lo
• stonato ≈ sto-NA-to

The stress is on:

• -nel- in ritornello
• -na- in stonato

A few useful pronunciation notes:

• Italian r is usually tapped or rolled
• double ll in ritornello is held a bit longer than a single l
• vowels are pronounced clearly, not reduced as much as in English

Yes. The plural is ritornelli.

So:

• Il ritornello sembra stonato. = The chorus seems out of tune.
• I ritornelli sembrano stonati. = The choruses seem out of tune.

Notice how everything changes for plural agreement:

• il → i
• sembra → sembrano
• stonato → stonati