I don’t do it while Im Doing the real speech, but I do practice a bunch with headphones on to the instrumental track. I did this for a school project one time. I printed the lyrics to an Eminem song that I know and one I didn’t know. Even without the music playing I could read through the one I knew without any issues because I know how it goes with music behind it. We use a different part of our brain to process music, so we’re more fluent that way. I started reading the song I didn’t know and instantly started stuttering and blocking. So my theory was that if we perceive talking situations more musically than we have an easier time talking. This is why I download an instrumental track that is as many beats per minute (bpm) as my regular talking voice. That way when I read the words I’m not singing it, but it flows naturally with my speaking. Then I right a speech and just talking along with that. If there is a pause in between paragraphs just let a bar or two of the music pass then continue. Really helps!