Waltz Music Sheet is an item form SPY Fox in "Dry Cereal".
In all storylines, a conductor will be playing music from this music sheet at the S.S. Deadweight.
In the Car Chase storyline, SPY Fox will need a copy of waltz music as part of his plan to get Walter Wireless into Russian Blue's purse. SPY Fox must secretly take a sheet from the music stand while the conductor isn't looking. After SPY Fox gets a sheet, he can trade it to Johnny Gecko for some of the latter's tango music (this will have Johnny play a waltz instead of a tango for the remainder of the story).