Miss DeGaetani said their concerts were "joint recitals, mutual in every respect."
The joint recital and the organ program are free.
He gave joint recitals with his mother Linda as early as February 1908 when he was barely 12 years old.
That day they performed a joint recital with string musicians.
Q. Why has a joint recital taken so long?
The couple married in June of that year and in the early years of their marriage continued to give joint recitals.
Blumenthal enjoys an active career performing joint recitals.
He has appeared frequently internationally, both as a soloist and in joint recitals with his father, or with his father conducting.
And in a joint recital on Wednesday evening, they showed that they have much in common.
Every year, around the time of Ms. Horne's birthday, which was yesterday, the foundation presents recent winners and honored guests in a joint recital.