Best way to transfer songs SVQ from XP 50 to performer :

Save on the xp 50 all your song in standart Midifiles.

Than you take your floppy(s)s and load them in the mac (HIP : don't forget XP 50 has DOS FORMATING. But new MACS now reads ok DOS FORMATING).
Than after having copied your files from xp 50 floppy to hard disk there are 2 possibilities.

Lauch Performer. Open or Import as MIDIFILE your file.

If you can't do that from Performer, it means that performer does not recognize the dos files. No problems !
Get an utility from MOTU (www.Motu.com) that allows all dos midifiles to be transformed so that then can be read and opened by Performer.

That's it.

Enjoy.

Best regards to all