Name the Tunes Tuesdays

Leave your answers to the tunes below as a comment.  I'll post the answers as music videos on Sundays, when I post artist and song picks of the week. 

Categories:
Easy:  I know the popular stuff!
Medium:  I know music!    
Hard:  I am a Music Guru!

Extremely Hard:  Music is my Religion!  (You can't stump me chump!)

Easy:  I know the popular stuff!

"I'm on a highway to hell.  On the highway to hell.  Highway to hell.  I'm on the highway to hell."

Medium:  I know music!    

"Girls, Girls, Girls.  Long legs and burgundy lips.  Girls,Girls, Girls.  Dancin' down on Sunset Strip.  Girls, Girls, Girls.  Red lips, fingertips."

Hard:  I am a Music Guru!

"You ain't nothin' but a hound dog.  Crying all the time."

Extremely Hard:  Music is my Religion!  (You can't stump me chump!)

"Lord, I hope this day is good.  I'm feelin' empty and misunderstood.  I should be thankful Lord, I know I should.  But Lord, I hope this day is good."