Petah, I don't get it ;(

Peter, why did he lock the door?

How do they =

What is the correlation between these two things

Peetah, What is the joke here?

Help

welp, i dont get it

Sharps flats and natural notation but that is all I know about this. Please enlighten me on this

Petah please help me

How come gregly aint used anymore

Why is this bad?