In this video, Brendan Hogan (Musiah Inventor) plays a really fun original character piece composed by Brendan himself entitled "The Worried Ghost". This particular piece is Lesson #128 on the Musiah Piano/Keyboard Lesson Course.
Lesson #128 is from the second last level of the course, Level 12 of 13. Some of the main challenges in this song include detailed phrasing, a compound time signature of 6/8, and advanced fingering and coordination challenges between the two hands.
Note: Brendan has posted a number of videos like this one to demonstrate some of the more advanced pieces on the Musiah syllabus. In the future, these videos will gradually be replaced by student videos as more videos from advanced students are received.