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Recently, I was replying to a comment on YouTube. I wrote this:
でも、「 ラットが死んだ」と「レッド・パージ！！！」が知名そうです
(But, Rats Died (a particular song) and Red Purge!!! (another song title) seem to be well-known.)
What I really wanted to say was that only those two songs were well-known. Is it okay to just do this:
でも、「 ラットが死んだ」と「レッド・パージ！！！」だけが知名そうです
or is that not correct? And what other ways can you say "only /a list of objects/" instead of only just one thing?
Thank you!
As far as grammar is concerned, it is perfectly grammatical to say:
「A と B だけが～～～です。」
You might, however, want to remember that native speakers do not use 「だけ」 nearly as often as Japanese-learners do to say these things. The sentence pattern that is commonly used by native speakers would instead be:
「A と B しか / だけしか / 以外{いがい}は + negative expression」
The first expression using 「だけ」 could sound "translated", meaning that it could sound unnatural at times if not always.
(Funny thing is that a sentence using 「しか」, which must be followed by a negative expression, would often sound more positive as a sentence than a sentence using 「だけ」 followed by an adjective, verb, etc. with a very positive meaning.)
The mistake in your sentence that actually stands out even more is the phrase 「知名{ちめい}そうです」, which makes little to no sense. Again, it was "translated", was it not? The phrases I might suggest would be 「有名{ゆうめい}なようです」、「よく知{し}られているようです」, etc. If you used 「しか」, those phrases would need to be turned into their negative forms.
The sentence I would recommend would be:
「でも、『ラットが死んだ』と『レッド・パージ！！！』しかあまり知られていないようです（ね）。」
The sentence that is 100% grammatical but would not necessarily be recommendable would be:
「でも、『ラットが死んだ』と『レッド・パージ！！！』だけが有名なようです（ね）。」
