Well, there is actually nothing here on the midterm yet,
but thanks for looking.  
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Well, as long as you did look, I guess I could say a few things.   It will mostly
cover the harmonic oscillator, ---simple, damped and driven.
Things like initial condition problems (simple or damped), and also 
the steady state solutions for the driven oscillator... like the dependence
of the phase and amplitude of the response on driving frequency.
Also using Fourier Series for the steady state response of a driven oscillator.
Make sure you know how to integrate using delta-functions.