My drummer wants to cover this tune, and I have this MP3 of unknown origin of Zepplin doing it. You can hear them count the tune in in 4/4, but once it gets going, the A part is clearly 15/8 (i.e. 1/2 a beat of 4/4 gets dropped). I count the 15 as 4/4/4/3. However, it seems to me that if I was going to count this in and it was really in 15/8, I'd be counting twice as fast and probably just give the last 3 of the 15. Is this part really in 15? Or do you think the whole band rushed 1/2 a beat? If it really is in 15/8, counting quarter notes seems strange.