Assuming you want to create tag-fields into the given flac-file from the related txt-file, using the converter "Textfile - Tag", or maybe doing this by actions ...
... at first please show us the content from the file "MumfordSon.0602537128143.AAMPN0160427.txt"
... and describe the meaning of each tag-field
... to guide you into the right direction.
See this german thread ...
/t/11900/1
DD.20130104.1718.CET