Dear G.,
I am friends with my neighbors too. I live upstairs and my downstairs neighbors likes to crank up the music too, I don't say anything as long as its off by 9 PM. Before 9 PM if it gets too loud, I turn on my dryer and the sound vibrates down and drowns out some of their noise. Usually, within a few minutes, the music is lowered or turned off all together.
There's probably a "noise ordinance" in your town or county. I would get a copy of that (it may be on line) and along with a note remind your friend and neighbor that you and your family rise at 5:30 AM and need your rest.
I use to have a noisy couple right next door, they would play music, drink and fight til all hours. They were usually winding down about 2 - 3 AM and I was getting up about the same time your husband does. One morning I decided to bang on their door when I got up. When she answered, I just asked, "Were you sleeping, because that's what I was trying to do when you two were raising hell all night". She looked pretty embarrassed. Now, I knew the couple and we were always cordial to each other, so I would not recommend anyone do that if you think an early morning bang on the door might get your lights punched out.
They moved out within six months, I think both of them were arrested, not due to the noise, but due to their lifestyle.
If your neighbor keeps it up and the manager won't do anything about it, I would continue to call the cops because sooner or later, the will be cited for disturbing the peace.
Blessings.......