R&B/ballad trio Urban Zakapa were the guests on the May 27 episode of 'Sketchbook,' on which they discussed the camaraderie within the group. 

It's been eight years since the group debuted, and all those years spent together have made them become similar to one another. Urban Zakapa said, "Our voices and personalities were different but we slowly came to take after one another the more we spent time together."

MC Yoo Hee Yeol asked the trio, "Were there any instances when you guys burst out into laughter while performing on stage?" Kwon Soon Il replied, "There are time when Jo Hyun Ah claims that she is using her 'head voice' and places the mic on her head. It's really funny [when she does that]." 

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Jo Hyun Ah put on a live demonstration of this strange singing method right then and there, placing the mic on her head and singing a couple lines. She explained this odd behavior, saying, "The sounds changes a bit according to the location of the mic."