What's the most common time signature in music after 4/4 and 3/4?
it depends how you write it down. but most music uses repeating patterns of 2, or 3.... 4 would be a repeating pattern of 2. the next available prime number would be 5, which is much much more rare to comprise the main time signature of a song, but it does happen, and there are a handful of famous examples, sometimes with the number 5 in the title