Spoken: Hello, children. It's time for an important lesson with Professor Flans. This is
four letters that people sometimes confuse for one: L M N O!

[I play this on the keyboard, so here are the tabs notes and the actual notes]
  GBb CD CBb GBb C (x32010@1)BbG
E--------------------------------|
B--------------------------------|
G--------------------------------|    4x
D--------0-----------------------|
A---1- 3---3-1-----1--3-1--------|
E-3-------------3----------3-----|
  GBb C (x32010@1)D (xx0232@1)GBb CD D (xx0232@1) GBb CD DD  DD DD DE----------|------------|------------|---------------------| (xx0232@1)B----------|------------|------------|---------------------|
G----------|------------|------------|---------------------|
D---------0|--------0--0|--------0-0-0|-0-0-0-0-0----------|
A---1--3---|---1--3-----|---1--3-----|---------------------|
E-3--------|-3----------|-3----------|---------------------|

The notes for the "ohhhhhhh... L M N O" part are like this:

DF GA GF DF GF D (xx0232@1) 4x

Then back to the first thing and then the second thing and then the third thing and then 
first thing! Do it on the keyboard if you can.