Dual Mystery Theme

Once again our songs outline a work of fiction. This time there is also something else all the songs have in common. See if you can figure out both. Answers at the bottom...

Song	Artist	Album
Islands	The XX	XX
Out at Sea	Heartless Bastards	The Mountain
#1 Crush	Garbage	Romeo and Juliet Soundtrack
Under Ice	Kate Bush	Hounds of Love
Winter	Tori Amos	Little Earthquakes
Blue Lips	Regina Spektor	Far
Hide and Seek	Imogen Heap	Speak for Yourself
Are You Out There	Dar Williams	End of the Summer
Help I'm Alive	Metric	Fantasies
Save Me	Aimee Mann	Magnolia
Sweet Surrender	Sarah McLachlan	Surfacing
Kind and Generous	Natalie Merchant	Natalie Merchant Retrospective
Solitude Standing	Suzanne Vega	Solitude Standing
Ode to My Family	The Cranberries	No Need to Argue

Story: Titanic
Secondary Theme: All Female Lead Vocals