The premise of Columbia University’s free Lunchtime Concerts, presented at Philosophy Hall, an intimate reading room ideal for chamber music, is that only one work should be played per program. On Monday, for the first installment of the pianist Benjamin Hochman’s survey of Bach’s six solo keyboard partitas, that work was quite short: the Partita No. 1 in B flat, which lasted just 16 minutes in an elegant, flowing performance.

Even preceded by Mr. Hochman’s insightful spoken analysis of the piece, with excerpts, the program took only 30 minutes. Some people had waited twice that long to claim a seat. Including standees, Philosophy Hall can accommodate only 180 or so.
Judging from the rapt attention of the audience during Mr. Hochman’s performance and the prolonged ovation, no one felt short-changed by the program (the first of three on consecutive days). The idea is for people to take a midday break, gather in a cozy space and focus on hearing a single work.
