Blu-ray is the highest resolution storage media format for high definition audio and video content in history. It’s lossless audio content, bit-for-bit identical to the original master recording, combined with the live performance by the artists in 1080p HD outperforms all previous formats in terms of delivering a total, immersive sensory experience at home that is un-rivaled in history. You won't find the Blu-ray HD Audio soundtracks available for downloading.
They can't be legally copied or downloaded from the internet because this level of resolution is protected by HDMI with the HDCP protocol, an encrypted two-way handshake between the source and the Preamp or DAC that confirms an authentic, secured connection. That only happens if the disc is in the tray of a Blu-ray player or drive, not from a download, connected by HDMI v1.3 or higher. Once that connection is made, you get to hear the best fidelity in history at home with the full bandwidth and dynamic range of the actual live performance.