I put up in Lucknow and I like singing a song when I am sad this is the way to. Relex your mind
When you listen to a song or when you sing a song, it relaxes all your negetive impulses. Not only relaxing it also helps us to connect to our self in a more 3D way. Yes, if we are happy and listen to some soothing songs it makes us happier and does the same if we are sad but the once and for all the sadness the undesirable feelings are subdued.