Huawei Nexus 6P :: Disable Lock Screen When Playing Music On Phone

I know you can do this with smart pairing of Bluetooth devices but I was hoping to be able to do the same for when I'm playing music through my car's auxiliary jack / over the phone's speakers. I've done a fair bit of googling but haven't found a solution. I use llama app on my phone to trigger events and have tried setting a trigger using the music app to trigger the screen lock to disable but it doesn't work. I'm wondering if it's feasible to somehow trigger screen lock to be disabled when a music app is active?