Andrew Bird makes good noises

"Not a Robot but a Ghost" by Andrew Bird

"Why?" by Andrew Bird (live)
(gets real good after the 2 minute mark)

Jaydiohead

"Dirt Off Your Android" by Jaydiohead
(Jay-Z / Radiohead mashup)

also:
"Fall In Step"

Fionn Regan

Sometimes you just need to chill out and listen to a dude playing a guitar.

"Be Good or Be Gone" by Fionn Regan
"The Underwood Typewriter" by Fionn Regan

(m4a format)

School's in Session

"Brothersport" by Animal Collective

"Nature of the Experiment" by Tokyo Police Club

"I Want Diamonds" by DJ Yoda (Kanye vs. Jackson 5)

"No One Knows (U.N.K.L.E. Remix)" by Queens of the Stone Age