I rented the Rolling Stones "Shine a Light" Blu-Ray the other day. I found it strange that it contained both Master Audio and TrueHD sound tracks. I don't understand why. Do they sound different? I thought it would not matter which HD format you include since they are both lossless. So wouldn't putting two flavors on the same disc be redundant? And wast space? BTW - I was not impressed at all with the sound. I'm used to watching concerts that hit you hard (almost like being there). This one did not. I tried all 3 sound tracks.