You don't have to identify a waltz, fox trot or rumba. The same steps will work for you. It can be used when dancing to their song. It can be used by the wedding party when they join the special pair. Or it can be used by you for your own enjoyment as you dazzle your friends with your new footwork.
Music can play a big part in making a dancer look more expert than they are.
For that reason there are also suggestions for songs for the first dance of the evening. I suggest you consider purchasing some practice music along with this video. The music has been specially chosen for its danceability for a beginning dancer .