On that KTSP 1990 clip, that theme is probably part of the same package as the "NightCast" theme. It would be nice to find a full 6 or 11pm open from 1989-92.
Finally, some Omaha station material:
KMTV 1990 News Tease: http://www.youtube.com/watch?v=LjfmfwdiXhQ
KETV 1984 Clips with news promos at 5:20 and 10:20:
WTVN Columbus 1979 clips:
http://dbs.galib.uga.edu/cgi-bin/parc.cgi?userid=galileo&dbs=parc&ini=parc.ini&action=retrieve&recno=13&format=_citation
14:40 "Bringing It Home to You" open
WTVJ 1974 newscast (with a newsdesk shaped like their '4' logo!):
A ton of other WTVJ newscasts from the 70s and 80s are posted. And the 1978 'behind the scenes' video.
I just love these vintage WPLG opens. The theme is interesting, in that it sounds similar to some of the "Tuesday C" bumpers that were used, but doesn't quite have the same signature.
WDTN Dayton 1985. At the time, WDTN was an ABC affiliate and the opening animation is the same as WLS and other ABC affiliate news opens ot the early '80s.
http://www.youtube.com/watch?v=CMXDn9D_3go&feature=relmfu