Hat sich erledigt. Falls mal jemand die selbe Frage hat, hier die Lösung aus einem anderen Forum:
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I found that songs can be renamed at any time with this simple procedure.....
(menu)
select(Song)(enter)
select(Load)(enter)
highlight desired song to rename(shift)(title)
Rename to whatever your heart desires...(enter)
Presto!....Now you have a meaningful title to your song
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Gruss Peter