Crusher-P
A composition written and produced by Crusher-P using Vocaloid GUMI ENGLISH to sing the vocals. On , it currently has over 37,600,000 views and hundreds of covers. On Nico Nico Douga, ECHO has over 5,600,000 views, becoming the second overseas VOCALOID song to reach the hall of fame (100,000 views) and first overseas VOCALOID song to reach the hall of legend (1,000,000 views).