Solist büyük bir salondaymışçasına güçlü şarkı söyledi.

It means as if or as though.

So büyük bir salondaymışçasına means as if in a large hall or as though he/she were in a large hall.

This ending gives the sentence a slightly vivid, literary feel. It is stronger and more stylistic than a very plain comparison.

It can be broken down like this:

• salon = hall
• salonda = in the hall
• salondaymış = apparently/as if he/she was in the hall
• salondaymışçasına = as if he/she were in the hall

A few useful points:

• The -da is the locative suffix, meaning in / at.
• The -y- is a buffer consonant.
• The whole form is written as one word because Turkish adds suffixes directly onto the word.

So this is not several separate words glued together randomly; it is one normal Turkish suffix chain.

Not really, at least not in the usual sense.

In a form like -mışçasına, learners should usually understand the whole ending as a comparison marker meaning as if / as though. The -mış is part of that larger pattern, not something you should translate separately as apparently in this sentence.

So here it is better to read:

• salondaymışçasına = as if in a hall

not

• apparently in a hall

That is the normal Turkish order.

In Turkish, when bir means a/an and there is an adjective, the usual pattern is:

• adjective + bir + noun

So:

• büyük bir salon = a large hall

This is why it is not normally bir büyük salon in a neutral sentence. That order can exist, but it usually sounds more marked or emphatic.

Because şarkı söylemek is the normal Turkish expression for to sing.

Literally, it looks like to say a song, but idiomatically it means to sing.

So:

• şarkı söyledi = sang
• şarkı söylüyor = is singing
• şarkı söylemek = to sing

Using just söylemek by itself usually means to say / to tell, not to sing.

Because şarkı here is a bare, non-specific object, which is very common in Turkish.

Compare:

• şarkı söyledi = sang / did some singing
• şarkıyı söyledi = sang the song, a specific song

With expressions like şarkı söylemek, the bare noun is especially common because the whole phrase behaves a bit like a set expression.

So in this sentence, şarkı söyledi is the natural general form.

From the intended meaning, it describes the manner of singing: powerfully, with a strong voice.

But this is a very reasonable question, because on the surface güçlü şarkı could also look like a powerful song, since adjectives normally come before the nouns they modify.

So yes, there is some possible ambiguity if you look at the words mechanically.

If someone wanted to make the meaning clearer, they might say something like:

• güçlü bir şekilde şarkı söyledi
• güçlü bir sesle şarkı söyledi
• gür bir sesle şarkı söyledi

Those versions make it more obvious that the strength belongs to the performance, not to the song itself.

The sentence follows a fairly normal Turkish pattern with the verb at the end:

• Solist = subject
• büyük bir salondaymışçasına = comparison phrase
• güçlü = manner
• şarkı söyledi = verb phrase

Turkish word order is flexible, but the final verb is very common in neutral statements.

If you move parts around, the meaning can stay similar, but the focus changes. For example, starting with Büyük bir salondaymışçasına... would put more emphasis on the comparison.

Yes, they are very close in meaning.

So:

• büyük bir salondaymışçasına
• büyük bir salondaymış gibi

both mean roughly as if in a large hall.

The difference is mostly style:

• -mış gibi is more common and everyday
• -mışçasına sounds more literary, expressive, or emphatic

So a learner will probably hear -mış gibi more often in ordinary conversation.

It is understandable, but it does sound somewhat compressed and literary, especially because of -mışçasına and the compact use of güçlü.

A more everyday version might be:

• Solist, büyük bir salondaymış gibi, güçlü bir sesle şarkı söyledi.

That version is a little more explicit and probably easier for most learners to process.

So the original sentence is not wrong, but it is stylistically denser than very plain spoken Turkish.