For Mary's best bits?

"You put a spell on me"

Black Magic Woman

Manic Street Preachers - The Intense Humming of Evil

Devil Woman

The laughing Gnome - David Bowie

Basketcase - Green Day

Mary by Scissor Sisters? Purely for the line "Mary, you shouldn't let them make you mad". Lol.

Urban Spaceman - Bonzo Dog Band

Say Hello, Wave Goodbye - Soft Cell, I think

Deep Purple - Strange Kind of Woman

or

Linkin Park - Crawling (if you dont like her)

or

Marylin Manson - Beautiful People (if you do like her)

That song by Bette Midler from the movie Hocus Pocus.......

Off the top of my head...

Screamin Jay Hawkins - She Put The Whammy On Me
Jimi Hendrix - Little Miss Strange or Voodoo Chile
Doors/Echo & The Bunnymen - People Are Strange
Stranglers - Just Like Nothing On Earth or Strange Little Girl
Siouxsie & The Banshees - Spellbound or Voodoo Dolly or Supernatural Thing or She's Cuckoo or Staring Back

Smack my bitch up - The Prodigy

Joe Dolce Shut uppa ya face

.... repeat answer for all housemates this year

Spice Girls - Who do you think you are?

They're coming to take me away ha ha.

Fields of the Nephilim - Last Exit For the Lost
Bauhaus - The Sanity Assassin
or even
Inkubus Sukkubus - Away With the Faeries