I don't know how to insert an umlaut from my phone. This isn't a problem encountered with the vergule or paranthesis which presents those who respond to this thread with an added challenge. I can't think of any songs but names of recording artists which have an umlaut in their name above the O include Blue Oyster Cult, Motley Crue and Bjork. In the case of Bjork I imagine the umlaut might be found amongst her song titles given, I assume, its use is native to her language, but I'm not that familiar with her oeuvre.