I'm trying to find the phase response between various signals by using
Matlab.  I have a bunch of sound recordings of a broadband 50ms chirp
underwater with different objects in the water and I wanted to see how
the phase responses differ depending on the objects in the water.

I was trying to use Matlab's help to look up phase responses, but those
all deal with phase responses of filters.  What I want is to be able to
compare two waveforms and see the phase difference for each frequency.
I know this is probably a simple question but my mind isn't thinking
clearly right now.

Any ideas?