Phonetic Brainwave Alphabet

I'm sure this has been covered before but I'm struggling to locate a post with all the brainwave frequencies explained in the same post?

My question is what state of mind can listening to each brainwave frequency enduce?

I have the Brainscan AS download which has 3 tracks:

16 min of BETA
20 min of ALPHA
30 min of THETA

I've really enjoyed the THETA track with my PROTEUS but think that if I understood what the sessions were actually trying to do I might get more out of all the tracks.

My other question with targeted CD tracks's like this is, should I pick one of the tracks only each time depending on what I want to achieve on that day or, time permitting, should I listen to all three tracks one after another for maximum effect and relaxation.

Cheers
Al