I don't know for sure, Brian. It seems like for about ten years now we've been getting fewer and fewer themes. Look at some of the 90's hits...Frasier, Everybody Loves Raymond...even back then you were just getting brief, several line themes or themes with no lyrics at all. My guess was always that it was because the networks wanted to slot more time for commercials, similar to why they cut the number of regular season episodes down to 18 from 22 (28 when I was in HS), and cut the regular running times of the shows.
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