Fire Release Secret Technique: Demon Dragon Flame Trumpet

After knitting all of the chakra into the pit of their stomach the user then shoots out a large stream of massive fire through their hands which takes on the shape of a dragon at the end. This gives the appearance of playing a trumpet, hence the name.

Trivia
Minato was seen performing this technique during Jiraiya's flashback of the time he remembered training him in the Konohagkure Forest