Actually, if you want food for thought for Ion, go read the work with a friend and have the two of you dialogue.  Some beginning questions:
 
Assuming the dialogue is about Ion due to its name, what do we learn about Ion?
 
What about Socrates?  What significance is his part in the dialogue?
 
Does an art of rhapsody exist?  What does Socrates have to say on this?  What does Ion have to say on this?  Is this applicable to music performance?
 
Does Ion know what he is talking about?
 
How does Socrates describe the effects of Homer's music?  Is this consistent with our culture's experience of music?  What are the viewpoints of the modern music conservatory and your music teachers?