WordPress MU

I'm trying to auto populate blog title in the tagline, but I cannot find what variable to add to the the line that reads

'blogdescription' => sprintf(__('Welcome to my blogpage (where i want blog title to show) on %s '), $current_site->site_name ),

does anyone know if this will work
'blogdescription' => __('My Blog'), sprintf(__('Welcome to my blogpage on %s '), $current_site->site_name ),

in addtion doe anyone know a variable to include on a post for blog title to add to a news article.