It happens quite often that inexperienced directors want to add music to their movie simply because they like it.
For example they try to hire one of their favorite rock bands for their drama just because they think it is cool music that would be cool to have in their movie. However, often this music doesn’t serve the dramatic purpose of the movie. You as a director might be happy if you hear your favorite music in your movie but there might be quite a big chance of your audience reacting quite irritated. Ask yourself whether the music you want to add really fits the movie. If you really want to have your favorite band in your movie, a good spot to feature them would be in the End Credits or a possible montage scene in the movie. We’ll have a look at songs in the movies later.