John Powell is the compositor of the instrumental soundtracks from Bolt.
He made so many soundtracks, for example, the soundtracks of:
Ice Age (1,2,3)
Kung Fu Panda (With Hans Zimmer, other exelent compositor)
Sr. and Sra Smith
Robots
Chicken Run
etc...

But the soundtracks that he made to Bolt... in mi opinion... are the BESTS

Just listen "Meet Bolt" with the piano solo
and "A Friend in Need", or "House on Wheels"

baah, just awesome, thats soundtracks are better than all other soundtracks on the world. Better than James Horner, Hans Zimmer and John Williams.

John Powell simply the best in bolt soundtracks

You Can Download this soundtracks of here
link

By the way.... is allowed to leave the download links? Because in argentina's forums (which is where I am) is allowed.. but i dunno if here is either =/

PD: Sry my bad english