figured them out:
rewrite ^/bg_sound_([^_]*)\.xspf$/includes/bg_audio_player/bg_sound.php?tributeid=$1 break;
rewrite ^/adamcarter$ /tributedetails.php?name=elvis_adam_carter&page=1 break;
I have one problem now, that is that they are not processed by php as therewrites are in the "location /" and not "location ~.*php$", is their any way tofix this other than putting the fastcgi lines in the "location /" section?
Posted at Nginx Forum: http://forum.nginx.org/read.php?2,2537,2557#msg-2557