Iv'e been looking for this song for a while now, its always in my head. Its got a lot of whistling involved and if i remember correctly i remember it being associated with Breaking Bad somehow (maybe a fan video). Only words or line i remember i think was "i don't know what he/she said" and or "torn to pieces" I believe a harmonica was in there somewhere and i don't believe its too old. Its a very laid back song, none of that Young Folks crap. Throw out some y'all know. sorry if wrong section
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I know they use the song Truth by Alexander in one episode. Not sure if its the one you're looking for but I think it's a great lesser known artist and song and has a mix of music in it - can't remember exactly but think there's whistling in Truth. His whole album is pretty good.
I'm pretty sure it's Truth. I forgot about the whistling as I had t listened to it in a while. I listened to the whole album once a day for about a month after it first came out. I need to break it out again. Truth is probably the best, catchiest and most recognizable but again the whole album is solid. http://youtu.be/s9yibUR5KNI
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To be fair, I'm working my way through Breaking Bad on Netflix right now, and saw that episode a week or two back and thought to myself "cool, they're using Truth". Glad I can help.