You and number two

Found a couple songs that might fit:
Be My Number Two - Joe Jackson
So In Love With Two - Mikaila
Lucky Number - Lene Levich

Hope one of these is what you're looking for - just fyi- in the future, you might have better luck if you can put in what type of music (country, pop, rock, etc) it is, and when you remember hearing it (yesterday, last year, when you were little, etc). Good luck!