re: How to stop car’s SYNC from automatically playing music from iphone?

I've got a Silverado so i've dealt with this too, it's annoying. I've learned that if i'm listening to music from my phone while driving, either a playlist or a music app, when i turn my truck off it will go right back to that music the next time i start my truck. So before i turn my truck off, i switch back to the radio and the radio comes on the next time i start it.
If i have Pandora or anything playing from my phone before i get in my truck, it picks it up as soon as i turn it on. If i close out of all of the music apps, it doesn't happen.