Singing sensation with powers of retention

Rebecca can sing a Disney princess medley with the best of them, and has actually begun to sing in tune most of the time. What really surprised me was that although music class ended more than a month ago, this evening, while I was changing her diaper, she began to sing all the songs from a typical class - in the order that they occur! That is to say - she started with the greeting song, and was singing the names of the other children in the class. Wow. I was really shocked.
Scary wondering: Does she really remember all the things I say and do, even when she appears to be ignoring me?!?! What about that time last week when I cursed another driver through my open window? (He cut me off when I had the right of way - he was at a stop sign, and I was in the stream of traffic, so I honked my horn, and then he gave me the finger, so I called him an a**hole ). And yes, the girls were with me (which is part of the reason I was so ticked off by his actions).