Popa,
1. The moderator will decide whether or not you are heard on this site.
2. We were talking about yehareg uval yaavor not whether it is prohibited. The rabbis realized that this was a put-on.
3. The point is that an action done under compulsion is not considered an action. See Rambam Hilchot Melachim 10:1 that a Ben Noach is patur when anus because he is not chayav in kiddush Hashem. This is the chiyuv of yehareg uval yaavor (therefore a Jew who does so because of onus is also patur as he is mevatel an asseh).
Sam, I heard that they also sang shirei Eretz Yisrael – which are also praises of Hashem. There are also heterim for other types of songs where there is no intent to get hanaah from her voice as brought down by Rabbi B;leich. Bli neder when I have some more time I will see if the sources are on the Internet.