Coldplay

Netsky

bob marley

xD

Dafuq

Moby.

This

The Thunderlords

The First Metal Band for Kids!
With Songs like I Like Dirt or Icecream Headache

Nicki Minaj

Nujabes

Nine Inch Nails - Ghosts I-IV. You can download first 9 tracks for free.

Job for a cowboy :P LOL

I'd like to throw a little Pink Floyd into the mix!

Not this kind of stuff I guess... But all jokes aside, how do they like ambient stuff? Because I can vouch for a little bit of Aidan Baker's stuff, like this or this. Some of his other stuff is more dark though, but he's mostly melancholic and chill.

Try some Brian Eno. Makes me dadadada, anyway.

http://en.wikipedia.org/wiki/Rockabye_Baby!

Try some classical. These sound like music for you, not babies.

Try Blackmill. Melodic dubstep FTW :3

Primus.

Puscifer - Indigo Children

Nice, calm and bass throughout.

Brian Eno or the italian pianist Ludovico Einaudi.

Daemon Hatfield or Robotobots