60s: I guess the TTTT '69 theme symbolizes that period more than anything for me. A lot of the other G-T themes from the decade could apply for early 60s.
70s: "Split Second" '72 seems, at least to me, like it could've been the prototype of upbeat and brassy "game show music". "Mindreaders" and "Make Me Laugh" could be quite representative of the later part of the decade, and the influence of disco.
80s: I think it'd be easier to name 80s themes that *didn't* sound 80s.
90s: Yes to the Stone-Stanley catalog, but also the later "Supermarket Sweep" theme----aside from Dave Koz's sax, it pretty much sounds like it was entirely done on a Kurzweil or Korg synth of the period.
While certainly not as memorable as the TPIR or even LMAD prize cues, whoever did end up authoring all of those pieces must have made some decent cash.
I seem to understand, at least through TVPMM (and the LOTHT package incident), that David Stanley himself penned the bulk of the S-S material.