Kim Chang Ryul ranked SPICA's Boa in terms of vocal prowess amongst other girl group members on his radio program, 'Kim Chang Ryul's Old School,' this week.

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Kim Jong Seo was on the show this time and while explaining his new song, "Home," he added, "SPICA's Boa featured on it for me.  I personally contacted her agency."

Kim Chang Ryul replied, "Boa is an idol, but she's more famous as a vocal trainer.  She's really good at signing.  In my opinion, she's within the top three vocalists of girl groups." Wonder where exactly she is ranked there and who the other two are!  Who are your three?