Well, I tried calling it UW_4_pelektor.mp3 - still not wotking
But when I loaded the song with Firefox, as well as changed the neme to uw4_pelektor, it worked!
Looks to me like another one of those Safari-related bugs that exists on some pages.
Could you be so kind as to delete the one called UW_4_pelektor if you find it?
Thanks for your help