Arthur vs. the Piano & The Big Blow-Up

Arthur vs. the Piano: Arthur's music class has a recital on Friday. Everyone except for Arthur is worried and practicing. Arthur is confident that he knows everything well enough until a nightmare makes him worry he may miss a note. In a subplot, D.W. has hiccups that will not go away.
The Big Blow-Up: Francine and the Brain have an argument over soccer practice that carries into class and through the next soccer match. They may not make the playoffs if the argument continues. Arthur uses D.W.'s idea of writing an early letter to Santa to resolve things between Francine and the Brain with fake apology letters.