Videomaker – Learn video production and editing, camera reviews › Forums › Technique › Sound › Using more than one background music track – advice needed! › What’s the best way to take a
What's the best way to take a picture of a cow? What about the best way to drive from here to there? What's the best meal to serve? These are all subjective questions much like your question on how to best use music. What we bring to the party is first our own individual aestetic first, then technical skills. Only you can make the recomendation based on the content, audience, etc.
Generally speaking, changing music per segment or topic is fine. Find cuts that reinforce the subject matter and are appropriate for the audience. Edit the music down to natural resolves rather than just fading out. Another option is building a bumper between segments with a recuring stinger. The sting can motivate and cover up the change in music track.