Here's a wee bit more suggestions:
Moloko- The Only Ones
KT Tunstall- Other Side Of The World
KT Tunstall- Under The Weather
Dido- Do You Have A Little Time
Dido- Hunter
Eliza Gilkyson- Requiem
Imogen Heap- Hide and Seek
Imogen Heap- Sleep <-----most of her songs are relaxing.
Sia- Breathe Me
Magnet- Lay Lady Lay (feat. Gemma Hayes)
Badmarsh & Shri- Day By Day
Robbie Robertson- Unbound
Hope you can at least get a couple from these.
Cheers!