In Tom Rothrock's "Rollin' Crumblin'", from the Collateral soundtrack, an instrument is used for the main melody, and I cannot identify it.
It starts at 0:15 for the first time, until 0:36, and then again from 1:16 until 2:21.
My best guesses so far are:
- Some sort of harmonica
- E-Guitar with lots of effects on top
If you know this I would totally love to hear other pieces with this instrument that sound similar! :)