What does Notenschlüssel look like on HTC?

On HTC it is the design shipped in Sense 8, shown above at full size. Older revisions are listed beneath it.

When did HTC add Notenschlüssel?

HTC first drew Notenschlüssel in Sense 7, released 30. März 2015.

HTC Corporation has shipped 2 versions of Notenschlüssel. Each is dated, so you can see when the design changed.

HTC

HTC Corporation has drawn Notenschlüssel 2 times. Every revision HTC has shipped is below, newest first.

What does Notenschlüssel look like on HTC?: On HTC it is the design shipped in Sense 8, shown above at full size. Older revisions are listed beneath it.
When did HTC add Notenschlüssel?: HTC first drew Notenschlüssel in Sense 7, released 30. März 2015.
How many times has HTC redrawn Notenschlüssel?: HTC Corporation has shipped 2 versions of Notenschlüssel. Each is dated, so you can see when the design changed.

HTC artwork for this emoji spans 2015 to 2016.