I believe that you should be yourself. That you should sing the songs that make you happy or sad as the case maybe, there are plenty of songs that make me cry, I can tell you. I've always loved those songs and each of the songs that I've written, although there are different types of song, have come from that love of music. Real singing music I should say not that opera stuff, although I do like some of those operatic arias. I do prefer simpler songs with melodies and good words. But as Enrico Caruso said, after he had become a great singer, you have to have a big mouth, a big chest, a lot of hard work, and something in the heart.
Here is his version of "Teddy Bears' Picnic". Thanks, IMEEM.