We usually sing in 4/4, which is so common that it is actually called "common time".
Sometimes we sing in 3/4 (which is a weird notation, why not 3/3?). Sometimes in 6/8, but just listening it is sometimes hard to really distinguish 6/8 from 3/4.
Without seeing the musical score for the music below, it is hard to know whether, for instance 13/8 is actually that or 6/8 followed by 7/8 repeatedly. What I mean by "13" then, is that the repetition restarts after 13 beats.
Finally a brilliant remix of Golden Brown
over a rehash of the Brubeck Take 5 video.