Guitar.

[Sky]

Rodrigo Y Gabriella.

Also:
Acoustic part of "Hotel California" by The Eagles
Limp bizkit - Behind blue eyes (REALLY NICE)
The intro of Under the bridge - Red hot chili peppers
Hurt - Johnny Cash
Wish You Were Here - Pink Floyd
More Than Words - Extreme
Babe, Im Gonna Leave You - Led Zeppelin
Soldier of Fortune - Deep Purple
Seagull - Bad Company
Good Riddance (Time of Your Life) - Green Day
Going To California - Led Zeppelin

Those are some that I like :P

Have fun listening!