A mystical work which he entitled "La Santina", was an Opus number on prayer and contemplation entirely done in the Tagalog language so the natives who did not know Spanish could also engage in the spiritual exercises of their teachers.
Alessandro Longo's 1906 catalogue (L numbers) was superseded by Ralph Kirkpatrick's 1953 catalogue (K or Kk numbers).
Opus Dei | Lucky Number Slevin | Reynolds number | Mach number | serial number | Random number generation | International Standard Book Number | prime number | Personal identification number | number | Two in a Million/You're My Number One | Social Security number | Rikki Don't Lose That Number | Prime number | Premium-rate telephone number | Mr. Holland's Opus | Jackass Number Two | Opus number | Number Girl | List of WTA number 1 ranked players | Lah number | Erdős number | Emergency telephone number | Betti number | You're My Number One | What's Your Number? | The Number 23 | The Murderer Lives at Number 21 | real number | opus number |
One of the few works where it is used is the Sextet in D Major for Two Violins, Viola, Violotta, Cello, and Cellone, Op. 68, by Arnold Krug.
The Chanson perpétuelle, Op. 37 is a mélodie by Ernest Chausson, written in December 1898.
Josephslegende (The Legend of Joseph) Op. 63, is a ballet in one act for the Ballets Russes based on the story of Potiphar's Wife, with a libretto by Hofmannsthal and Kessler and music by Richard Strauss.
Ludwig van Beethoven's opus number 27 is a set of two piano sonatas both entitled Sonata quasi una Fantasia for their combination of freedom of form with sonata structure.
Zur Namensfeier (French: Jour de fête, English: Feastday or Name day), op. 115, is a symphonic overture in C major by Ludwig van Beethoven completed in 1815, and first performed on Christmas Day 1815.