I followed Dillogic's YouTube tutorial called, "KLWP Tutorial: Music Progress Bar" and I couldn't get it to work playing music with Amazon Music. After trying it with Play Music I realized that KLWP and KWGT could not get the track position from Amazon Music. I have bought all of my music on Amazon Music so if there is a way to fix it I would appreciate it a lot.
Unfortunately Music Support depends on Player supporting the Android Standards, if Amazon Music is not sending the progress update to the Android Media control there is nothing i can do, this has to be fixed on their end.