Another odd difference between the two kids that may or may not mean anything - DD#2 is really good at singing along to songs. She knows heaps of songs off playschool, sesame street, wiggles, advertising jingles etc and will sing along to anything on the radio after the first verse. She keeps in time and tune quite well.

DD#1 had a brief tuneless dalliance with twinkle twinkle little star when she was 3 but otherwise has always just made up monotonic wails rather than singing existing songs. Sometimes she hums discordantly to the tune of TV shows.

But I guess I could put this down to a total lack of musical aptitude rather than anything more ... despite this being her 3rd year of piano lessons ...