Grandmaster-
“one or two ‘bad words'” is no big deal?
Bad words are not nice and not the way a person should speak, because a person should only speak ???? ????. However, when said out of the context ??? ?????? ??? ??? ????? ????? it is pashut that they aren’t the ????? ?? the Gemara (that I mentioned above) talks about.
TBT-
The Mishne Beurah in Shaar Hatziun (560 note 25) quotes the Shelo who says mothers should not sing their baby to sleep with non-Jewish lullabies since it creates a bad nature in the child.
Correct. However, first of all ?????? the Shlah is talking al pi kabbala. Nobody brings a source in halacha, in fact the Mishnah Berurah himself as I quoted above is matir using non Jewish tunes in davening. But more importantly, his words are ???? ?????, romantic songs, so for all I know pshat in the Shlah and the Shaar Hatziyon is that such songs likely contain messages in the lyrics which could be damaging.