Does anyone know the title of this ANIME?

I've been searching for this anime my problem is that I dont remember it's title I've watched it before but i can seem to remember it all i know is its story. . . well they are a group of people formerly a band at their earlier stage of life but now their just common husbands, there is a war going on at "space" human VS. aliens and they were recruited by this organization cuz the only way that their weapon fires is when they play their instruments its like the rhythm from the performance is their source of power . . . hope someone knows this.