I often use Filmora Video Editor, because it's fairly inexpensive and simple to use. However, if you'd prefer to use something that's free, you might try MiniTool Movie Maker.
Thanks for the tips, Rachel. I'll try the freebie first, and if it's not enough, I'll try the paid option. I don't have many of these to do, so I don't want to spend a ton on software.
I wondered about that too. I will try the MiniTool Movie Maker and see if I like it. I do not want to pay a lot of money either. If I have more clients that want to add music I will look into something that I have to pay for.