Can a group of girls (11-14 years old) sing together in a nursing home?
If men will be present it is forbidden. See here (excerpt below).
From the age of 11, a girl may certainly not sing in front of men (or boys over 9). Some Rabbonim are of the opinion that even girls from the age of 6 should avoid singing in front of men. Some are careful even from age 3.
While there is a minority view that makes a distinction between a single girl singing and a group of girls singing, the general consensus in halacha is that no difference exists if it’s one girl or a group singing in front of a man.
Sources:
ראה בהנסמן בנט״ג יחוד נד, ח. ולהעיר מלקו״ש יא ע׳ 58 הע׳ 20 ובשוה״ג. וראה בהתקשרות גל׳ תשד במדור בירורי הלכה. וכן הורו למעשה רבני אנ״ש בחוברת פסקי דינים לבנות חב״ד (תשע״ג).
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