Subsequent generations of Von Trapps turned to other occupations, but Sofia Von Trapp and her younger siblings grew up singing songs, such as the Austrian folk songs that their grandfather taught them.

Growing up in rural northwest Montana in the United States, they are often asked, "Are you related to The Sound of Music Von Trapp family?"

According to the Von Trapp children, it was a question that their father, Stefan von Trapp, avoided for years as he sought a normal, quiet existence for his family in Montana.

"We were home-schooled and our mom took us to music lessons as a hobby and stuff," Sofia says.

"Eleven years ago, Grandpa got sick and we decided to do a recording for him. It ended up being a bigger project than expected, and it turned into our first CD.

"But this was never planned."

The very next year they were booked on an overseas tour to Austria and made three more CDs.

The Von Trapp Children also sing songs they collect in other parts of the world, either a capella or with an orchestra.