That project gameplay is your idea or teacher idea?
Because making level change according to music is not trivial.
For spectrum visualiser you can use plugin.
Then you need to see how that plugin can communicate with blueprints.
Then use those messages to change level.
plugin is there:
https://forums.unrealengine.com/showthread.php?94974-eXi-s-Sound-Visualization-Plugin-(works-in-cooked-builds)-4-12-UPDATE-EXAMPLE-MAP-RELEASED