Is a man allowed to listen to a woman on the radio? Would it change if you saw the actual girl (e.g. on TV singing)? Related: What is the source for a woman's voice as ervah?
There is a famous Teshuva of the Sridei Aish, Rabbi Yaakov Yechiel Weinberg, that permits one to hear kol isha (a women's singing voice) when there are other people singing. Where is this Teshuva ...
Should a woman avoid singing in front of her husband while she is a niddah? Is it strictly prohibited or just inadvisable? (Obviously I am not talking about deliberately seductive songs.)