The last century's composers tried to "escape the tyranny of the bar line", ie did not want to be locked into a system where one beat/ time measure was more important than the other, some of the ways that they got around this was by using time signatures that changed a fair bit, even if it meant an extra 1/4 note here and there.
This is not new in pop btw, even the beatles wrote like this on occasion, eg had a 5/4 bar in the middle of 4/4.
Most time signatures can "rock"/ be danceable if required.
I write quite a lot like this,
here is a little excerpt from a tune of mine called giving time,
www.songcarver.mac.com/sites/giving_time.mp3
it moves from 3/4 to 4/4 to 9/8 and 9/4 and combinations of above.
The excerpt is a 9/4 section which is going into 4/4
I find it difficult to work this way currently in LIVE.
SongCarver