Well, if you've ever written a composition before, you wouldn't think it was stupid; 2/4 amidst a 4/4 song is actually the most common change for me when I'm writing.
I count intro of "Caught in a Web" as 4/4 then 2/4 because I like my snares on the typical third beat. So if you count your beats twice as quick, you'll see that it's fits better than 3/4 because with 3/4 the snare is on each two which is a bit weird (or each three if you double the time).
And that part in Voices is in 9/8, not 9/4 (and there's a lot more than two measure of it), otherwise it would sure be a strange rhythm before it :P
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