Music at a Siyum Meal During Bein HaMetzarim

I am Ashkenazi and serve as a ram in a Sephardic yeshivah. After much effort during the summer zman, the students are making a siyum during the days of Bein HaMetzarim, before the Nine Days, and they would like, in honor of the siyum, to hold a kumzitz of soulful songs with a guitar in my home. (No dancing, only quiet songs)
Is this permitted and appropriate? Is there any issue with my participating? Also, the members of my household will hear the music — is there any issue with that?

Shalom u'vrachah 

The ruling of our teacher, Rabbi Amram Fried shlita, is to be stringent at a siyum meal and to listen only to recorded music, not live musical instruments. 

However, for Sephardim who follow the custom to be lenient in this matter, it is certainly permitted even with musical instruments. 

There is no issue for Ashkenazim to hear music played by a Sephardi in a permitted manner, all the more so when he is playing for the purpose of a siyum, regarding which many Ashkenazim are lenient lechatchilah. 

Therefore, there is no problem at all with the students playing, and with you and your family participating and listening.  

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