"Martial Art" is a broad term encompassing the many styles of physical discipline (fighting) arts that have been developed over the centuries. To say that the style of Songahm Taekwondo is just another "martial art" would be an oversimplified explanation of the world's largest centrally administered martial art. This system of teaching and training is unequaled in the martial arts community.
The Songahm curriculum:
A beginner does not focus on being a skilled martial artist within a month or two, as a strong foundation in Taekwondo must be built first. Trying to advance beyond your level without proper guidance is like building a house on concrete that has not dried. Though the house may still stand, the foundation would not be as strong and the appearance of the house may not be as presentable.