Update
I've visited your website and see you have a custom made CMS. The CMS probably uses modules, therefore I think the 'title' part of the output html is generated in another file than music.php.
You have to look for a file that contains code that generates <head> and <title> tags. This file can be located anywhere, it is not possible for us to know where the developer locates his file. Anyway, in this file you will be able to see HOW the code 'receives' information about the title that needs to be printed. Look for usage of this code in the music.php file.
The information about the artist is available somewhere in the music.php file. You somehow have to pass that information to the code that 'provides' title or head information to the code in the file you had to find at first...
Please understand that your question is very difficult to answer properly with this little information, and maybe worse (no offence) this little experience.
Old answer:
<head>
<title>Syrian Students Music Center <? echo $subTitle ?></title>
</head>