short mp3 file description:

filename:

101 Artist - Titel.mp3

metadata:

titel: 101 Artist - Titel.mp3
interpret: Albumname
album: Albumname
genre: Pop

no Tracknumbers are defined in metadata

the quintessence is, that he sorts the songs acc. the metadata "titel" from 1, 2, 3, ... till z ( my experience with no assigned tracknumbers )