Snowstorms on the East Coast this week are forcing changes for the Quad-City Symphony Orchestra concerts this weekend.

Elissa Lee Koljonen is unable to travel the Quad-Cities for this weekend's performances. Her husband, violist Roberto Díaz, was able to get a flight to Chicago and will perform as scheduled. He will be joined in performing Mozart's Sinfonia Concertante for Violin and Viola by one of America's greatest violinists and the concertmaster of the Chicago Symphony Orchestra, Robert Chen.

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The Quad-City Symphony Orchestra also will perform romantic favorite Fauré's Suite from Pelleas and Melisande and Mendelssohn's "Italian" Symphony. Masterworks 4 will be performed today and Sunday. Tonight's concert is at 7:30 at the Adler Theatre, Davenport, and Sunday's is at 2 p.m. at Centennial Hall, Augustana College, Rock Island. This concert is sponsored by Deere & Co.