Tab Header Question - script

[zalipresents]

I use a script in the footer of every datapage to have the tab header include my logo & the name of the datapage. What I need now is for the tab header to also include a string field from the datapage...how do I do that?

Current footer code is:
<script>
var v_link = document.createElement('link');
v_link.setAttribute("href", "http://login.zalipresents.com/wp-content/uploads/2015/09/Zali_logo_Z_Tab_Icon.png");
v_link.setAttribute("rel", "shortcut icon");
document.head.appendChild(v_link);
</script>

I'd like to have the tab label read: Z (logo inserted like screen shot) WORKING - [Artist]...i'd like this artist name to also show up in the little box that pops up when you hover over the Z or WORKING. Any suggestions? 

 

The field is called "Artist"