What's the best album/soundtrack from a bundle?

Shatter is pretty darn good.

Bastion and Sequence as well

Fairy Bloom Freesia Soundtrack
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I still maintain that the surgeon simulator soundtrack is the best thing since sliced bread ;)

New songs from new surgery types are also good too though those haven't been bundled yet, but the anniversary edition upgrade DLC includes the whole soundtrack aswell

Luftrausers is pretty good if you like synth heavy stuff

Hmmm I'm not really into soundtracks unless I've played the game before, and that's never happened so far
If you do though maybe you'll wanna check out the groupees synth bundle

Not really a bundle but I enjoyed the soundtracks from PAYDAY 2. IMO definitely worth the dollar spent during the sale.

Until Transistor is bundled it's Shatter and Sequence (mostly like Bobo said)

I bought it before it was in a bundle, Frozen Synapse has been in a few bundles and has some excellent music.

Bit Trip Beat OST - The Information Chase feat Bit Shifter
One of my favorite songs.