Lossless audio compression reduces the original file size of a song while preserving all of the data perfectly. Apple Music is making its entire catalog of more than 100 million songs available in lossless audio at different resolutions. In Apple Music, “Lossless” refers to lossless audio up to 48kHz, and “Hi-Res Lossless” refers to lossless audio from 48kHz to 192kHz. Lossless and Hi-Res Lossless files are very large and use much more bandwidth and storage space than standard AAC files. You can listen to lossless audio using the latest Apple Music app on an iPhone, iPad, Mac, or Apple TV 4K. Turn on lossless audio in Settings > Music > Audio Quality. You can choose between Lossless and Hi-Res Lossless for cellular or Wi-Fi connections. Note that Hi-Res Lossless requires external equipment such as a USB digital to analog converter. For a full list of compatible devices, please see support.apple.com/en-us/HT212183. Lossless audio is not available with the Apple Music Voice Plan.