Edited to rephrase this as a question as I'm not so sure any more :p
If it were 13/8, wouldn't each bar would comprise two 'patterns' (forgot the correct term) with the second beginning halfway between beats 6 and 7? IMO makes less sense than it beginning at the start of a bar of 13/16.
Edited to rephrase this as a question as I'm not so sure any more :p
If it were 13/8, wouldn't each bar would comprise two 'patterns' (forgot the correct term) with the second beginning halfway between beats 6 and 7? IMO makes less sense than it beginning at the start of a bar of 13/16.