The title of a piano arrangement of a Touhou song (Hakurei Reimu's Theme) is:
「東方永夜抄 - Imperishable Night.」 より 博麗霊夢のテーム
(Question) What does より do in the title?
If it were to mean "from the game "Imperishable Night"", would から be just as suitable?
より as well as から means 'from'. This is the primary meaning. Many languages use the word corresponding to 'from' for introducing the standard for a comparative. It is the comparative usage that is the derived meaning.
There are many uses of より that are not comparative per se.
In some communications, when A writes to B, A starts his letter with "Bさんへ" (To B). And when he signs, A writes "Aより" (From A).
Also , one can write "ニンテンドー3DS 本日より値下げ、新価格 1万5000円" to express "Starting today, the 3DS becomes cheaper with a new price of 15000 JPY".
Moreover, as a source of information is cited, より is often used: 天気予報により明日は雨です: according to the weather forecast, it will rain tomorrow.
(Nota bene: in this case, より is the verb よる in 連用形, hence the presence of particle に before it. One could also say "によって" or "によると".)
Finally, your case is also a source (but not a retransmission of information nor a citation). It's just "from". This feels (and probably is) more formal than "から", and is very common.
