You know how you can listen to something for years (sometimes decades) and suddenly hear something new all of a sudden? I decided to haul out "Crystal Illusions" this morning and listen to it and I was surprised to hear something I've never noticed before: I'm pretty sure Gracinha is one of the singers on "Dois Dias". It's more noticeable in some sections than others (notably the first verse). I'm curious if any of you other longtime Sergio listeners can hear her, or or my aging ears deceiving me?