An unsung hero.
An unsung hero of the labor movement.
The backstage crew of the movie were the unsung heroes.
The third hymn remained unsung.
It's a great place to find an unsung hit that will kick start your new obsession.
She is the great unsung heroine of British feminism.
The many benefits of volunteering often go unsung - the good you do for others tends to eclipse the good it does for you.