Starting in Chapter 4 of Stray, you will be able to explore a cyber town in which you will need to collect several notebooks before you can continue your stray cat adventure. While you explore these "slums", you can also complete a few secondary quests such as that of the robot "Morusque" (he is in the alley to the left of the guardian robot) which consists of bringing him 8 sheet music.
For your hard work, you'll be rewarded with the “Miaulodie” trophy/achievement and along the way will get your first badge, the music badge that will permanently display on your cat's jumpsuit. Here is the guide that will allow you to recover all partitions.
List and locations of all sheet music in Stray:
The first sheet music can be found in the robot Momo's house (you need to go to his house for the main quest). Once in his apartment, look for a door with bars and search the room to get the sheet music on a shelf.
The second sheet music is near the apartment where you got Clémentine's notebook (on the roof). You're a cat, so make sure you get on the balcony overlooking the window of Clementine's apartment and you can get the second score from the wooden table.
The third partition is in the lower area of the slums in the alley where the Grandma is who asks you to bring her electrical cables. In this alley, look for a door to scratch with your cat paws and someone will open the door when you do. Search the interior of programmer Elliot's apartment to discover the third sheet music which hangs on the corner of a painting.
To get the fourth partition, go to the alley on the right where the guard is located to trade with the "Azooz" robot at the market. He will drop the score in exchange for a 2K speed energy drink. You will find it in the vending machines in the slums that are still in working order. They are recognizable by the light they give off.
The fifth sheet music is obtained very easily by going to the bar of the slums (lower part of the city). You just need to jump on one of the wooden tables inside the restaurant to pick up sheet music 5.
The sixth partition is close to where you found the second partition, namely in Clémentine's apartment which is accessible through a window from the roofs of the slums. Search near a bed with iron bars, there is a chest of drawers where you can retrieve the score you are looking for.
The seventh sheet music can be found on the rooftops in Doc's apartment. You will know when you are in the right apartment since it is filled with shelves with books. The apartment strongly resembles a library! Search in this area until you come across a piano and grab the sheet music that is placed on it.
The last sheet music might be a little harder to find... To the right of "Morusque", the robot musician you bring the sheet music to, look for a safe on the floor among the pile of junk. Here you will get a note that gives you a clue to get the code. In fact, you just have to go to the slum bar and step on the counter.
Above the "Dufer Bar" sign, there's a board you can knock off with your cat's claws. Behind the table, you will find four numbers, namely "1283" which actually corresponds to the combination of the safe. All you have to do is go open it and get the eighth and last sheet music.
