The 70s again, through the lens of TV theme tunes

I’ve recently become somewhat fascinated by a number of 1970s TV themes. They’re not theme tunes of shows I ever watched, and not themes I remember. Rather, they’re tunes which have something odd or off-putting about them. First up: The theme from LWT’s “Weekend World”. The YouTube clip is an 80s recording, but the same music was used in the 70s too; Wikipedia tells me it’s “Nantucket Sleighride” by Mountain, and that in the 80s the show used a cover version.