I have practically no music notation experience, so please consider me a dummie when answering.
I am reading this Wikipedia article, about the clave rhythm. They use a text only notation looking like this:
1 & a 2 & a 3 & a 4 & a || X . X . X . . X . X . . ||
1 e & a 2 e & a 3 e & a 4 e & a || X . . X . . X . . . X . X . . . ||
Is this a standardized notation? Does it have a name? Where can I read more about it?
I believe that the first line specifies 'points in time' and the second specifies which of those times should have a beat. But what points in time are specified? What do the 'e', 'a' and '&' mean?