Songs that people dance to...Do you mean dance songs, or songs that people dance to? Can be very different genres!
Classic songs that people dance to are Proud Mary, Chain Of Fools, What I Like About You, Brown Eyed Girl, Mustang Sally, Gloria, Play That Funky Music White Boy, Honky Tonk Woman, most Motown songs, etc. The oldies but goodies always work, even with the younger crowd. If a song moved young people then, it still moves young people today.