The Three Weeks

We are waiting eagerly, especially during the three weeks, for the redemption and for the time of the Mashi'ach. How will things look at that time?

The Halachot that during the nine days by Rabbi Mordechai Eliyahu Zt"l.

We sold our home and have been renting because construction on our new apartment is not complete. Now, it is basically ready, but lacks a Tofes 4 (municipal permission to inhabit). If we get the Tofes 4 during the Nine Days, is it permitted to move in then?

We sold our home and have been renting because construction on our new apartment is not complete. Now, it is basically ready. Is it permitted to move in then?

What are the special Halachot of the Three Weeks "Bein HaMetzarim"?

Is listening to music permissible during the Three Weeks before the Month of Av?