The reason the MTU Import Database does LN, FN is the "comma"; it is used by our Songbook, Search, Edit Songs features to identify where the LN ends and the FN begins (called a field delimiter).
This allows the Songbook to generate Artist books alphabetized by either LN first, or FN first. Sometimes I wish we had never listened to those who want their books in LN first order as it adds a lot of work for us, and confuses sone users.
Having said that,if you want to be 100% compatible with MTU convention, then enter your Artists as LN, FN.
Also, please have your computer on-line when you identify these in the "Import HD files" or "Import CD tracks" screens. Then, your entries are sent to our website. We try to publish these monthly as an upgrade for our users.