Guess the Song

This song is a childhood story, a tail we all grew up with. With both underwater life and a flowing melody, it's words travel the currents all the way to our hearts. It inspired us to dream big, sing till the fish swam home, and to comb our hair with a fork(It wasn't as easy as it looked). I still sing it till this day, always looking up to the surface and reaching my hand to the air(it is a famous part of the song). What song am I describing?