After the tank sequence, your team will be tasked to sweep the buildings towards the hotel on foot. As you turn left in the alley, look for a broken piano behind the car to find the music sheet on top of it.
After squeezing through a tight door inside one of the apartment buildings, Pvt. Rogers who went ahead of you will be pinned by a hiding german trooper. Shoot the trooper immediately to save him. Clear the immediate area of enemies then head to the upper floor. You have to reach the fireplace where the memento is sitting by carefully jumping on what remains on the floor.
After reaching the hotel and blowing its corner wall, find the reception counter on the right side and jump over it. The memento is found below the counter.