Sometimes you can learn thanks to videos you could think that are funny but useless... for example, do you know the videos of "Pulcino pio"? There is a version in each language! So through that catchy tune you can learn about onomatopeias and animals...
Here, in English! ("The little chick cheep")
Here, in French (Ici, en français, "Le poussin piou")
So, while singing... you learn a lot!!!