Jaden Ouyang, an eighth-grader at St. Mark’s School of Texas, performs with Texas Cellos.(Shelby Tauber / Special Contributor) Joseph Kuipers knows the unique power of the cello and how it can ...

The cello is a very fine instrument - just ask Yo-Yo Ma - but it has some fundamental weaknesses. The most obvious one is that there's no way to play more than two of its four strings simultaneously.