No, Sephardim, do not get married during the 3 weeks. Sephardim do not listen to music during the 3 weeks. Do not know where you got that information. I have never heard of any Sephardi get married during the 3 weeks. There may be an engagements, but no music, of course.
During the 9 days, no meat. and for the other things like showering and laundry, Sephardim hold Sh’vuah Sha Hal Bo. Since Tisha B’Av falls on a Sunday, there is no week, this year. So it is permitted for Sephardim to shower, and do laundry this week.