All the soaps used that, much cheaper than an orchestra. Although now days most of it’s done on a synthesizer which is still only a "one-piece orchestra."
I’ve always liked Day’s music. I fact, several years ago I bought a CD of it. That was when I realized they were not using an orchestra but the synth. You can hear the similarity of all the songs but I still think it has always been very good. IIRC, in the past, Corday himself had written a lot of it. I don’t know if he still does.