Join me in welcoming 22 new band members. Another 15 coming soon. Enjoy this quick concept test 😁🙌

The video likely performed well due to its unique and creative concept of using Lego figures to represent band members playing a keyboard, combined with a playful and intriguing caption that sparks curiosity about the 'onehackerband' project.

The video shows a line of small figures, resembling Lego characters, arranged on the keys of a MIDI keyboard. The figures are playing the keyboard, creating music. The creator captions the video by welcoming new band members and calling it a concept test.