Firstly, your music needs to acknowledge your tastes so that you both enjoy it. It's also wise to have some breadth in the music styles so that everyone hears something they can relate to. The most important thing is to engage a professional DJ who can read the room and play what people respond positively to. If there is something that is very popular and you absolutely hate it, or it was played at someone's funeral, let your DJ know. There is such a vast range of artists out there and great music from a range of eras to choose from; not playing one famous artist or song won't detract from a great evening. You might find that the DJ fills the floor with a certain style of music. Often, you and your friends and family like similar music, but there is sometimes a guest who likes a style that is very different from the majority. It's quite possible that guests may not get their request played if it would empty the dancefloor. Asking guests for a request can work, but always say that the tune will be played at the discretion of the couple and the DJ.