Once your Tamagotchi reaches the teen stage he will be visited by what I can only describe as what looks like a monkey head with wings. This monkey head will look like he's talking and then give your Tamagotchi a random instrument. After that go to the last icon on the top, the one that looks like a door. In that menu select "Away" then press B or the middle button again and your Tamagotchi should be shown at a school building meeting two other Tamagotchis. They will talk and make noise then switch places then you can name your band. Once your done with that they will play a little song for you. After that you can see what that band mates names are by going to the scale icon, or the first icon on the top, and selecting "Band" from the drop down menu.