Not only of the latre Lubavitcher rebbe, but the whole dynasty of Liady going back to its founder, would and do grace the walls of many Lubavitcher dining rooms. As for hasidic "rock" concerts, my first question is was the audience mixed and if so was there a michitza? If not, then, of course the rebbes would see this as an example of gross immodesty that vcould likely lead to other forms of mixing. Also the racous mood at such a concert would be seen as a potential danger that can lead to other undesirable things.
Guatemala judge orders former President Otto Perez Molina detained for hearing in fraud scandal (AP)
from the article: The ultra-Orthodox arrived en masse