At one point, they did something unexpected. It was a montage sequence where McCloud and the girl (played by Smith) begin to romance one another. Now, usually when a TV series does that, there's a lush music score played over but this had a full, original song. That's common for movies, but rare for TV -- most especially in 1973. Indeed, it's probably one of the first "music videos." And the thing is, the song was quite nice. It's very sweet and more of the era, but good enough that, when checking the song out, it turns out a popular singer of the time, Matt Munro, actually recorded a version of the song and released it.
I was able to track down the TV sequence. For those who don't know the McCloud series, the title of the song comes from one of the character's catch-phrases, "There ya go."
Bonus Note: at the 1:02 mark, you'll see a guy in a suit sitting around, seemingly keeping an eye on the couple. The actor is Eddie Egan. The name might be familiar to you. There's a reason for that. For those of you who have seen The French Connection, this is the real Eddie Egan who Gene Hackman's character is based on. (After leaving the police force, he took a flier on acting, and made a number of appearances.)