SMTown Live '10 World Tour

Super Junior's Kyuhyun and Girls' Generation's Seohyun, had a duet with "Call With My Heart".

Tour dates

Date	City, Country	Venue
August 21, 2010	Seoul, South Korea	Seoul Olympic Stadium
September 4, 2010	Los Angeles, United States	Staples Center[5]
September 11, 2010	Shanghai, China	Hongkou Stadium
January 25, 2011	Tokyo, Japan	National Yoyogi Stadium
January 26, 2011
April 2011	Taipei, Taiwan	TBC

seokyu wants duet double in japan ??? maybe yes ^^