I'm 41 years old and have only just realised that the alphabet song is to the tune of twinkle twinkle little star. DS age 2 was singing it (without words, his speech is a bit delayed) and I was all excited he'd learnt a new song at nursery, when DH pointed out it sounded exactly the same as twinkle twinkle which he's known for a while! Anyone else never twigged they're the same?