Anything that gets people over the 90 second hump is a good thing. If they've watched that long, so they feel invested and will go through the majority of the video.
With that said, music is not a band-aid. Someone is not going to say "Oh, the content is horrible, the presenter doesn't inspire me, but the music is awesome!"
It's important to keep anything background simple. Stay away from lyricized music unless you want to feature the band. Changing it up to fit the mood is also important. It doesn't hurt to stop talking for a bit of music, bringing you into a new thought.
And doing it wrong - that hurts and helps. At least you get people commenting how out of place the music is...
Want to see how it's done right? Watch a WWE program. They have the magic sauce when it comes to making a "Shoot" video (where the wrestler comes out to talk about something). The wrestler's theme plays, they show up pumped up, they rile up the crowd, then talk with no background music until either the end (when their music plays them out), or another wrestler's music interrupts to have a confrontation.