Cellist Yo-Yo Ma smiles at Civic Orchestra of Chicago Concertmaster Emily Nash during the performance of Dvorak's Cello Concerto at Senn High School during a free open rehearsal concert Monday December 10, 2012. | Tom Cruze~Sun-Times

Cellist Yo-Yo Ma and Principal Conductor of the Civic Orchestra of Chicago Cliff Colnot talk with the orchestra and audience in between performances of Dvorak's Cello Concerto and Beethoven's Symphony No. 6 at Senn High School during a free open rehearsal concert Monday December 10, 2012. | Tom Cruze~Sun-Times

Cellist Yo-Yo Ma and the Civic Orchestra of Chicago perform Dvorak's Cello Concerto and Beethoven's Symphony No. 6 for a sold-out crowd at Senn High School during a free open rehearsal concert Monday December 10, 2012. | Tom Cruze~Sun-Times

Cellist Yo-Yo Ma chats with the Principal Cellist of the Civic Orchestra of Chicago Joshua Zajac before the performance of Dvorak's Cello Concerto and Beethoven's Symphony No. 6 for a sold-out crowd at Senn High School during a free open rehearsal concert Monday December 10, 2012. | Tom Cruze~Sun-Times

Cellist Yo-Yo Ma and the Civic Orchestra of Chicago, conducted by Cliff Colnot, perform Dvorak's Cello Concerto for a sold-out crowd at Senn High School during a free open rehearsal concert Monday December 10, 2012. | Tom Cruze~Sun-Times

Cellist Yo-Yo Ma and the Civic Orchestra of Chicago, conducted by Cliff Colnot, perform Dvorak's Cello Concerto for a sold-out crowd at Senn High School during a free open rehearsal concert Monday December 10, 2012. | Tom Cruze~Sun-Times

Cellist Yo-Yo Ma and the Civic Orchestra of Chicago, conducted by Cliff Colnot, perform Dvorak's Cello Concerto for a sold-out crowd at Senn High School during a free open rehearsal concert Monday December 10, 2012. | Tom Cruze~Sun-Times

Concertmaster Emily Nash and Principal Conductor Cliff Colnot (R) join Cellist Yo-Yo Ma as they take a bow following the performance of Dvorak's Cello Concerto for a sold-out crowd at Senn High School by the Civic Orchestra of Chicago in a free open rehearsal concert Monday December 10, 2012. | Tom Cruze~Sun-Times

Concertmaster Emily Nash and Principal Conductor Cliff Colnot (R) join Cellist Yo-Yo Ma as they take a bow following the performance of Dvorak's Cello Concerto for a sold-out crowd at Senn High School by the Civic Orchestra of Chicago in a free open rehearsal concert Monday December 10, 2012. | Tom Cruze~Sun-Times

Cellist Yo-Yo Ma is introduced to the sold-out crowd at Senn High School as he joins the Civic Orchestra of Chicago in a free open rehearsal concert Monday December 10, 2012. The pieces performed were Dvorak's Cello Concerto and Beethoven's Symphony No. 6. | Tom Cruze~Sun-Times

Cellist Yo-Yo Ma is introduced to the sold-out crowd at Senn High School as he joins the Civic Orchestra of Chicago in a free open rehearsal concert Monday December 10, 2012. The pieces performed were Dvorak Cello Concerto and Beethoven Symphony No. 6. | Tom Cruze~Sun-Times

The Civic Orchestra of Chicago cello section warms up before a free open rehearsal performance of Dvorak's Cello Concerto and Beethoven's Symphony No. 6 at Senn High School Monday December 10, 2012. | Tom Cruze~Sun-Times