I have known and loved men for whom expressing emotions in the normal course of things was virtually impossible. Singing is the only way they know to get those feelings out (although they may not consciously know this, and certainly wouldn't admit to it). When these guys sing, their careful mask drops away and they let you see into their heart and share feelings they'd never dream of expressing in conversation. Because those deep wells of emotion, never shared in other contexts, come out only when singing, their singing is incredibly, potently compelling. Unfortunately, it's not the stuff on which solid, long-term partnerships are built.