i think that in general you will find that people in "orthodox" circles follow the following rule in many situations: "Unless I specifically know it's permitted, it's prohibited." And i believe qol isha is one of those situations. So, as Shalom pointed out, many college educated Jews who looked into the halachoth regarding the issue will more than likely not frown upon hearing a group of 3+ women singing because at that point it becomes to impossible to distinguish which voice belongs to which girl, and therefore circumvents and sexual immorality. And there are many rulings that say that ANY recording of women is not considered a woman's voice, such as the ruling of Ovadia Yosef.
Maran Rabbeinu Ovadia Yosef zt”l rules (in his Responsa Yabia Omer,
Volume 1, Chapter 6 and Volume 9, Chapter 108, Section 43) that
according to the letter of the law, one may act leniently and listen
to a woman singing over the radio and certainly in a recorded format
from a while before. Additionally, this is especially true if one has
never seen how the woman singing looks since one has never looked at
her or her picture. Nevertheless, even if one has seen the woman
singing, since this is not the woman’s actual voice, this is not
However, Ovadia Yosef is a renowned Sephardi posek. Which means your typical "orthodox ashkenazi community" might not follow his ruling, or might have never even heard of it. Or they might follow their own Ashkenazi rulings that disregard Ovadia Yosef completely:
On the other hand, Hagaon Harav Eliezer Yehuda Waldenberg zt”l took issue with this ruling on Maran zt”l, for although even according to his opinion, hearing a woman’s voice over the radio is not prohibited, nevertheless, how is it that Maran zt”l ruled so leniently for the public (as a blanket ruling)? Certainly, listening to women singing would cause individuals to have improper thoughts which is a Torah prohibition itself! Thus, according to Rav Waldenberg, one must rule stringently and not allow room for leniency when there is cause for the public to stumble.
Source for both: http://halachayomit.co.il/en/ReadHalacha.aspx?HalachaID=3688
But i think the most likely situation you will find is people not really knowing what is permissible and what isn't, and so they might be opposed to hearing any woman sing because they aren't sure what the halacha is. And so even if you've checked all the halachot, studied them in depth, you might still find a large percentage of people who thinks you're making them sin by playing the radio.
And so if you are trying to "prevent" other men from sinning via qol isha, then this is a more complex subject that has to do more with "who are you with" rather than "what the halacha is." Because there are lots of very reputable halachic sources on these issues, and communities/individuals just kind of pick and choose between them, or are ignorant of them all and just say no to all female singing.
A side example would be the following: i follow the kashruth rulings of Rabbi Yitzchak Abadi, which means i can buy most of my food from any regular supermarket. However, MANY orthodox Jews won't buy anything that doesn't have a hecsher on the label. So when it comes to feeding Orthodox Jews in my house i have discovered that even though i could be feeding them completely kosher food, they might not consider it kosher. So what i do is i tell them in advance that i follow the rulings of Chacham Yitzchak Abadi, a famous Orthodox posek, to give them enough time to research him and come to a decision. And then if my guests are okay with that, i feed them.