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I really think 'Nothing Like Us' would be great! hmm...another one i can think of is Birdy's cover of 'skinny love'

Any songs by Passion Pit

Toner (Instrumental Suite)-

Fix You- Coldplay

Smash Into You - Beyonce

The Moment I Said It- Imogen Heap

Adele

Back to Manhattan by Nora Jones

We are Young by Fun

All the Rowboats by Regina Spektor....this one may be a bit fast!