I saw that Maran Harav Ovadia Yosef said that one can listen to music for a siyum during the 3 weeks. I was curious if this also applies to the 9 days and maybe even the week of Tisha Be'Av. I want Marans answer ideally.
Yes, he can.
Sources from Laws of the Holidays, p. 285, by Rabbi Yonatan Nacson of Yechaveh Da'at and https://instarabbiapp.com/:
Yechaveh Daat 6:34; Halichot Olam, vol. 2, p. 138; Chazon Ovadia, Arba Taaniyot, p. 151; Torat HaMoadim, Ben HaMetzarim 5:4; Yalkut Yosef, Ben HaMetzarim, p. 208.