http://revach.net/article.php?id=919

Section: Halacha   Category: Tshuvos
Using Non-Jewish Tunes For Mussaf of Rosh Hashanah?

The Rema paskens (53:25) that a chazzan that sings non-Jewish tunes should be warned to stop and removed if he doesn't do so.  The Mogen Avrohom says this doesn't mean in his free time, but rather that he uses these tunes as part of his davening.

The Bach says that this only applies to songs that were composed specifically for service of Avoda Zara or songs that have words that everyone knows.  When people hear these songs it will conjure up the exact opposite images that we should have in our head during Tefila.

However goyish tunes without any words or words that are unknown to most people are permissible to be used in davening as has been the minhag by many Gedolei Yisroel.  (Piskei Teshuvos 53:27)

Important Note: We try to convey the Tshuva to the best of our ability. We admit that our understanding may not be accurate. Please also understand that this Tshuva may not be the final word on this topic. One should consult a Rav before drawing any conclusions.