Hello!
I really like your idea for the random message generator. The way you used the switch to get songs by the specific band was a really good implementation of switch that I did not previously think of.
One piece of advice is there are two improvements that would help clean up your code
const randomBandIndex = Math.floor(Math.random()*bands.length);
const chosenBand = bands[randomBandIndex];
These two lines can be combined into one: const chosenBand = bands[Math.floor(Math.random()*bands.length)];
same goes for these two lines as well;
const randomActivityIndex = Math.floor(Math.random()*activities.length);
const chosenActivity = activities[randomActivityIndex];
These two lines can be combined into one: const chosenActivity = activities[Math.floor(Math.random()*activities.length)];
Fantastic work on your project! Keep it up!