Yes they are. I thought that may have been the case so I tried just recording the music by holding my phone next to the computer speaker and then downloading that file, but I still got that error when importing to premier
Thanks for reaching out. I had experienced something similar once. As @Steve_Grisetti mentioned, I was using an unsupported file and that too with with copyright protection. I was unable to see the file at the time of importing it. Could you share more details:
What is the format of the music file that you are using?