Standard codec is Opus!? Pretty interesting, because isn't opus supposed to be a really good lossy codec? : r/AmazonMusic
Richard Joo - Billy Joel Opus 1-10 Fantasies & Delusions Music for Solo Piano - Amazon.com Music
Mr. Holland's Opus - Original Motion Picture Soundtrack by Seattle Symphony Orchestra & Michael Kamen on Amazon Music - Amazon.com
Live Is Life (Live) by Opus on Amazon Music - Amazon.com
PAGANINI,NICCOLO - 24 Caprices Opus 1 - Amazon.com Music
Sorabji: Opus Clavicembalisticum: Geoffrey Douglas Madge: Amazon.de: MP3 -Downloads
MUSIC TO TOUCH YOUR HEART / OPUS # 1 by Andrey Brandl on Amazon Music - Amazon.com
Opus by MR SAM on Amazon Music - Amazon.com
Back to Future by Opus on Amazon Music - Amazon.com
Til The Cops Come Knockin' - The Opus/The Urban Theme by Maxwell on Amazon Music - Amazon.com
HiBy R2 Portable Lossless Music Player, mp3 Player with Bluetooth and Wi-Fi, Entry-Level Hi-res Audio Player with True High Fidelity Sound Quality- Black : Electronics - Amazon.com
So it looks like Amazon is using Opus codec on standard tracks for Android : r/AmazonMusic
Opus 1/2 by After Midnight on Amazon Music - Amazon.com
Amazon.com: BT: Electronic Opus (High Fidelity Pure Audio Blu-Ray) : Bt, n/a: Movies & TV
Opus Metropolis by Teknoaxe on Amazon Music - Amazon.com