That's one of the biggest mistakes you could make. Most people love the more simple tunes with a clear and steady beat. Anything additional is for audiophiles like ourselves who take notice. A truly simple melody and bottom line will carry further and have a tendency to become stuck in people's heads. One thing I like to do is hum the song for a while, or play it back in my head and see how catchy it is. So the key is: Don't over think! =)