@ChrisBacking5-Knoblach To open MP3 files you need to pay for the "More Tracks and Formats" feature in the Music Maker in-app-store or buy a Plus or Premium Edition. As a workaround you can convert the MP3 files to WAV with a free tool like XMedia Recode before opening them in the Free Edition of Music Maker.
Thanks I ended up buying the premium edition instead of finding out what else I might need. Now on to the tutorials to figure out click tracks and delaying the start of songs for a few beats.