Terrada Music Score's Gvido is an E Ink sheet music device, that lets you see sheet music pages (PDFs) on two 13.3" flexible (Mobius) E Ink displays. The device also includes input via a stylus (Wacom). The device features Wi-Fi, bluetooth, 8GB of internal memory and micro SD slot. The whole device weighs only 650 grams.

Gvido photo

The Gvido was introduced in June 2016 and is scheduled for release by the end of 2017.

E Ink display info: 
Dual 13.3" flexible E Ink displays