I can't remember whether or not Rose checked in on if St Olaf exists in this world. There are some parts that don't transfer from our home to here, so not all the details that Rose knew might not be here.
Writing songs in memorial for somebody isn't done much in these "modern" times. The only one that readily comes to mind is when Sir Elton John's song Norma Jean, which was already for a classic film starlet, but he sang it in honor for Princess Diana's death. If there are any more, I don't know.