I love singing in other languages! It's a fun way to learn. I find I prefer songs sung in one of the romance languages best. This is simply because the words of those languages, even when spoken, have much more of a musical rhythym.
When the movie La Vie en Rose came out, singer Edith Piaf became a favorite singer in our house. For me, there is something about singing in French that feels so much more romantic (Though I know people who have heard my voice think differently !)
Did you know the Beatles have a song in a foreign language? No, not Michelle. It's much rarer than that popular one. On the Past Masters album you can hear them sing "She Loves You" in German. Sie liebt dich, yah, yah, yah!