Meet “Fragments,” a project whose first installment — of six — Weilerstein will perform at Zankel Hall on April 1. Certain aspects of it may be familiar. She will be there, playing solo. She will perform a Bach suite in its entirety, and she will play it with her typical, heartfelt passion. She will offer new music: quite a lot of it, selected from works by 27 composers she has commissioned.

Alisa Weilerstein is streaming one movement of the Bach Cello Suites a day, just as she has released a polished studio recording of them.