Mixtape Contest Week 2: Songs that lower the blood pressure

The first week was a smashing success. This week will hopefully be as good. Last week's winner was FlowerGirlPhysicist, and as the winner it is her responsibility to pick the new theme for this week's contest. And she's picked an excellent theme.

FlowerGirlPhysicist:

Okay, so badly composed idea here.
I keep, as a playlist a collection of songs that do something very special. When one comes on, I can just feel my blood pressure dropping and my heart rate going down. This has nothing to do with tempo or volume - some songs are soft and slow, others are loud and fast. I cannot possibly be the only person this works on - so I want to know what's the music that does it for everyone else?

So there you go. Same rules apply. You can view them here. Playlists are due by Tues. April 1 at noon CST. FGP will choose a winner, and that winner will be announced Wednesday. Looking forward to seeing the submissions.