When you request a song from a Dj, we love that you say the song clearly and at least two time before you move. Deejays have music in their ears at all time so you also must speak up. Now i know we all drink and have fun and dance till it hurts. But if the request is good, it will be played. However if you ask for a country song and i am in my dancehall set, the country will not make the cut. Trust me on this.
If you were/are a wannabe Dj and you think it fits into the set, tell the Dj the song and let th Dj do their job. If the song is not played, it probably means it did not fit the flow or you were wrong about the song. No problems. Maybe it will fit at a later time.