Q:

より not used for comparing?

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?

A:

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.

A:

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.

A:

You are correct that より means from, and can be replaced with から. - rdbより

