[OCR04300 - Sonic Unleashed "Rainfall Rush"]

The beginning of the track reminds me SO MUCH of Phantasy Star IV .

[OCR04198 - Sonic Unleashed "Adabat's Sunset Speedway"]

This reminds me a lot of the opening theme from Phantasy Star IV.

[OCR03803 - Chrono Cross "The Fairy and the Water Dragon"]

A hauntingly beautiful remix for one of my favorite tracks from Chrono Cross! Great work! 

[OCR03730 - Mega Man X & X4 "Rolling"]

I just can't stop listening to this track, it's VERY GOOD!!

[OCR03675 - Sonic the Hedgehog 3 "Samba del Anjos"]

This is WAY FAR from Brazilian samba, it's something more to a jazzy, big band salsa that is played at the Caribbean clubs but damn this is a great upbeat remix! Keep up the good work! =)
Yeah, I've read about the naming mistranslation and your friend is correct saying it should be "Samba dos Anjos" but it's also incorrect in Spanish where it should be "Samba de los Angeles".

Best regards!