Not necessarily, it depends on the mp3 file. If the file only contains music, then it should import fine. On the other hand, if the mp3 file contains images or certain ID3 tags it would fail during import. This problem has been around for years and is caused by the MS library used to import mp3 files. With SONAR X3d, the import process has been modified to use a different MS library and no longer has this limitation.