Here's a silly little ditty I wrote to the tune of Journey's Open Arms in which Hermione tries to get Ron to do his own schoolwork. I suppose Potions and Transfiguration give Ron more headaches than Charms, but those don't quite have the same ring to them...
O in Charms
Sitting beside you,
Watching you work,
I know that you could do fine.
Why should I whisper
Into your ear?
This is your problem, not mine.
I want our professor
To know that you're smart;
It might be nice if you tried.
He could be giving you
An O in Charms.
I take great pride
In getting good grades,
So if you earn
An O in Charms,
Ron, it won't be
'Cause you copied from me.
O in Charms.
Working without me,
Working alone...
It would be good for your soul.
What if I told you
Without me here
You could accomplish your goal?
You owe it to Flitwick.
Decrease my distaste.
Cheating is a waste.
He could be giving you
An O in Charms.
I take great pride
In getting good grades,
So if you earn
An O in Charms,
Ron, it won't be
'Cause you copied from me.
O in Charms.
