It's not unusual to hear the sounds of the grand piano filling the rotunda of Rochester, Minnesota's Gonda Building.

Visitors are known to tickle the ivories as they walk by.

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On Wednesday the rotunda was packed with hundreds of people eager to see a performance from a couple that has become a YouTube sensation.

91-year-old Marlow and 85-year-old Fran Cowan have been playing together for nearly 63 years.

They first performed at the Gonda Building during a visit in the fall of 2008...

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