"Hello" is a production marvel. Produced and co-written by Greg Kurstin, the track is built on layers of haunting piano, echoing percussion, and, of course, that legendary vocal power.

Mastering and processing signs to watch for

The standard compact disc (CD) uses 44.1 kHz, which, per the Nyquist-Shannon sampling theorem, accurately reproduces frequencies up to 22.05 kHz — just beyond the nominal 20 kHz limit of human hearing (for young, healthy ears). A 192 kHz sample rate extends theoretical frequency reproduction to 96 kHz.

noted upon release that XL Recordings did not provide a 24-bit Hi-Res version of the album

You hear the contrast between her soft whispers and belting notes. Subtle Details: The high sample rate captures the decay of the piano notes and the texture of her breath. No Distortion: