Music plays a huge role in telenovelas. Plots and characters are defined by the music that accompanies them. However, it's the incidental music the one that underscores every scene establishing its mood: romance, humor, suspense, etc. The incidental music also signals the transitions between scenes.
In this video Victor Escalona explains how incidental music works in a telenovela. He uses examples from Cosita Rica.
The video is in Spanish, but I think it isn't difficult to figure out what Mr. Escalona is saying.