Substitute life

OK, time to get serious here. No more Halloween riddles. Today's topic is substitute teaching and the courage it takes.
Just ask Ralph. He has survived five days of it, and was all ready this morning for the automated call to go back in, and the phone didn't ring.
Relieved? Maybe. But he feels now that the kids in music class will be wondering where he is, since he played some select CDs yesterday ("Rubber Soul" was one, Brian Setzer another) and today was ready to ask them to "deconstruct" a rap song they told him they liked.
He looked up the lyrics last night and was prepared to work with them on something in which they had expressed interest.

* Update: Ralph called the employment agency after I wrote this. There was an assignment at the high school. Kid Two groaned...too bad, huh? Dad's at his school.
Ralph is teaching science today. Well, not teaching, but babysitting science classes. More later.