Singing head canon – Can and Can’t
The only time Sokka will sing is in the bath or when his life somehow depends on it. He’s picked up a lot of songs in his travels, catchy tunes that he can’t get rid of. In either case he sings horribly, especially when he’s bathing as he tend to go from humming to a sudden outburst and back to humming, all out of tune. Azula can hear him in the next room.
Azula can sing, but she won’t. Ever. Never ever again.