OoP: Questions, Ideas and my own Prophecy

[Tamara]

No: HPFGUIDX 61907

First off, is anyone else ticked that they haven't sung the school 
song since the first book????  I miss it.  Especially since there are 
rarely other mentions of music, and I believe music to be a VERY 
important part of life.  But that's just me.

Second: There were 30 (31 counting Harry?) students in his first 
Defense Against the Dark Arts Class.  How can that be? From what I 
could tell, there were only Gryfindors, or at least only Gryfindors 
asked questions.  And I don't remember mentions of other houses 
sharing DADA class with them in previous books.  So just how many 
Gryfindors are there in Harry's year?  And if it wasn't just 
Gryfindors in the class, was it also Hufflepuff and Ravenclaw? 
Because you'd think it would mention if Draco were there.

Third: What the sorting hat said/sang. "The four good friends decided 
and never did they dream that they might someday be divided." Anyone 
else see this as a prophecy/warning of sorts for what might happen to 
Harry/Ron/Herminone/Neville?/Ginny? or even to 
Draco/Crabbe/Goyle/Pansy?

Fourth: Why does McGonagall never call Harry "Harry"? She always 
calls him Potter.

Fifth: God and Wizards.  I've noticed that they don't take the Lords 
name in vain, as most normal people would.  Wizards say "Merlin's 
beard!" or "What in the name of Merlin are you doing?"  So do they 
consider Merlin a godlike wizard?  If they do, that would definitely 
have to connect them to the royal family, as Merlin was King Arthur's 
advisor.

Tamara