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I don't think they are synomys, but may be wrong. I see Prima pratica as a style, while "stile antico" (old style) was the use of this style later when it was already old-fashioned. I don't see what the reader would gain from a merge. --Gerda Arendt (talk) 20:06, 13 August 2013 (UTC)
I have the impression that both terms are very old and have been used similarly since Monteverdi times at which time the old-fashioned-ness of stile antico was probably not yet established or at the very least disputed.
Also if the same style is still used long after its heydays are over it is not necessarily a different style or is it?
The problem is that all terms saying "modern" and their opposites are only valid for a certain time. I confess that I had never heard of "prima pratica", but see "stile antico" often when Bach uses old style, for example in the Gratias of his Mass in B minor. You could not say "prima pratica there", and a link to this article as it is now would not help much, --Gerda Arendt (talk) 08:59, 14 August 2013 (UTC)
I agree entirely with this last. "Stile antico" is the common term, at least when speaking of Baroque music. Merging the two would be subsuming a common term under a more obscure one. Furthermore, Gerda's point above, that they don't seem to be truly synonyms, is well taken. Gould363 (talk) 02:52, 19 March 2015 (UTC)