I have a reputation for writing guitar/rock music in odd time signatures, and being able to play it and change between such times without skipping a beat.
To me, this does not seem like an unusual ability, but it seems to plague some of my fellow musicians who try to keep up with it.
Now, I am not claiming to be an especially great guitarist; not by any stretch of the imagination. I can't play a blues scale, and I can't solo to save my life. At least, nothing virtuosic such as the likes of Devin Townsend or Fredrik Thordendal. But I do seem to have a knack for these odd time signatures.
I think it comes down to how I think about the rhythms I'm playing. Let's take the time signature 10/8 for example. It's a complex time signature, compounded by the fact that it's not what it looks like.
10/8 looks just like 5/4 if you reduce it to the lowest common denominator, so it has five beats per bar, right?
Well, unfortunately, that's not right. 10/8 has four beats per bar, not five. Typically it's played as two "long" beats, followed by two "short" beats.
Make sense?
No, I didn't think so. I believe this is where my classical composition background comes into play, because I can visualise what's going on in notation, and count appropriately.
In the case of 10/8, instead of thinking "one.., two.., three, four!", I count on a
much shorter timescale. My counting of 10/8 goes "ONE two three, ONE two three, ONE two, ONE two"
Does that make more sense?