Wikipedia on TV programs

"Older American television shows began with a Pilot title sequence, showed opening credits at the bottom of the screen during the beginning of the show, and included closing credits at the end of the show. However, beginning in the 1990s some shows began with a "cold open," followed by a title sequence and a commercial break. Many serialistic shows begin with a "Previously on..." (such as 24) introduction before the teaser. And, to save time, some shows omit the title sequence altogether, folding the names normally featured there into the opening credits. The title sequence has not been completely eliminated, however, as many major television series still use them in 2008."


Because of the 24 minutes (circa) blocks of time allotted to tv shows, there is less time allotted to the title sequences. Perhaps on specialty programs there is less of a limit, because if I was to do one on art, it would be a one time thing, so it is getting the viewer sucked into the show.