When my students imagined a mini traffic helicopter reporting on congestion in the school hallways, they recorded and repeated the middle of a sound effect of a passing helicopter. Then they decided to make their onboard dialogue suggest they were yelling to be heard over the engine noise. So they sat back two or three feet from the micronphones and shouted their dialogue. In the movies and television, music is heard all the time. It sets the mood, builds suspense, even comments on the action.
Radio uses music more sparingly.
The music bridge does what the dissolve performs in the camera media. It tells the listener the next scene is later or somewhere else. The music comes up with the end of one scene and fades under with the beginning of the next. In the simplest of technical arrangements you'll need another recorder or player to add these to your classroom productions. An audio mixer is recommended.