Ok after I got home I found this. I had no idea that a Titmouse could vary it's call in such a way.
I always thought it was a just a very fast "Peta, Peta, Peta". Apparently not.
https://www.youtube.com/watch?v=Sc58PMVAm_0It had to be Tufted Titmouse. It was loud and well hidden in the trees across the street.
I will have to take a closer look next time I am there.
Napper