Yeah, it's just having hits every certain number of notes, with two different numbers. For example, 5:4 has one part playing every five subdivisions, and one part playing every four (or something like that--it doesn't have to be that exact). Dig:
Code:
1+*+2+*+3+*+4+*+1+*+2+*+3+*+4+*+1+*+2+*+3+*+4+*+1+*+2+*+3+*+4+*+1+*+2+*+3+*+4+*+1
x---x---x---x---x---x---x---x---x---x---x---x---x---x---x---x---x---x---x---x---x
x----x----x----x----x----x----x----x----x----x----x----x----x----x----x----x----x
1+*+ = 1 e and uh.
Two against three, or simultaneous hemiola, is generally considered the easiest polyrhythm. Try it.