Thank you so much.

And yes, I will for sure tell you about the matchmaker stage. It sounds to me (from reading the tamagotchi manual) that BOTH parents stay with the egg or baby for 24 hours.
I thought I'd give some info about the main games, so I'm going to write what it says in the manual. Here it is:
Sing a Song:
First, listen and memorize the melody example. Then it's your turn to play the same song using 3 buttons. Songs will get harder as you proceed through each level.
Music notes:
Get rid of falling notes by selecting the correct notes. Use button (A) to select the right notes and press button (B) to eliminate the falling notes. (Honestly, I cannot figure out this game for the life of me!)
Sound Block:
Jump from block to block (which will come and go randomly) and keep going until you reach the goal block. Use button (A) to jump left and button (C) to jump right. When the number in the block reaches 0, it will disappear. Be careful not to fall off.
So far, since my tama is only a teen, school also has a game. Pre-school has the jump rope game (Woot!), and high school has a game where you click the right buttons when the music notes appear. This game is fun because you see the rest of your band practicing with you!
Another thing is that your tamagotchis can turn into seniors! When they do, you can form a senior band. Isnt' that funny?
Another thing:
There is a "door" icon now.It's really cute, because when you select something from the "Door" option, it shows your tama walking out of the door. When you select it, it says "Away", "Shop" and "PC". When you click "away", you go to school. (And maybe the music contest when your tama becomes an adult. Not sure...) When you click "Shop", yup, you guessed it, it's the shop!

And when you pick "PC", it gives you the log-in code for TamaTown.
Speaking of TamaTown, it says on the back of the container that your Tamagotchi Music Star comes in, that there is now a Music City online. It's like an entire new town. It says you can personalize your own music room, create and produce your own music tunes, and upload your tunes and become the #1 star.

When I searched for this "Music City", I couldn't find it! So I contacted Bandai, and they emailed me back saying that the site will hopefully be starting this week!
Btw: My Tamagotchi Music Star just turned into a mametchi! YAY!