Sometimes, a sad song helps me feel and understand the depth of sorrow I might be having trouble with. Say I'm stuck on some assignment in the Far East at Christmas time, and I miss my family back home. If I were to listen to "I'll Be Home for Christmas" it would doubtless trigger some strong sad emotion. Yeah, my situation sucks but I'm facing and feeling that fact, which gets me thru it. Sometimes bad things happen to people and they avoid the emotional impact, which can turn them into wierd, shallow people.