Watch High School Musical: The Concert for Free: How to Stream the Movie Online at 123Movies. . Be a part of an incredible concert event as the worldwide phenomenon goes extreme! "High School Musical: The Concert" invites you behind the scenes and puts you in the middle of the action. Step out of the audience and jump onstage with Corbin Bleu, Monique Coleman, Vanessa Hudgens, Drew Seeley, Ashley Tisdale and more of the cast of the award-winning hit movie "High School Musical" as they perform their chart-topping songs in this sensational concert.