Besides Navi, IU is another solo female singer that has an incredible vocal range and she is still only 16.
In the past few weeks, IU has released a couple of UCC videos showing her in the recording studio as she covered several hit songs in recent times. On the 4th July episode of KBS2TV Yu Hui Yeol's Sketchbook, IU appeared before a highly appreciative live crowd and stunned host as she performed acoustic covers of Gee, Lies and Sorry Sorry while strumming the guitar. She did a helluva of a good job with the covers and really showed to everyone again what she is capable of.
She also performed her own songs, Boo and You Know which sounded better than the usual. Must be the live band and music equipment.. and IU.
She ended with an english song, Tamia's Almost.