| Title | O magnum mysterium | 
| Creators | William Byrd (composer) | 
| Opus | |
| Instrumentation | mixed chorus soprano, alto, tenor and bass | 
| Number of movements | — | 
| Keys | G major | 
| Composed | — | 
| First published | 1607 | 
| Dedication | — | 
| Tempo markings | — | 
| Metronome markings | — | 
| Time signatures | — | 
| Average duration (sec) | 300 | 
| Number of measures | — | 
| Composition types | Graduals, Motets | 
| Language | Latin | 
| Period | Baroque | 
| View on IMSLP |  | 
| Code |  | 
(No sections)
| Details | Section | Arranged for | Arranger | 
|---|---|---|---|
| view | Complete | 4 recorders | Daniel Harmer | 
| view | Complete | 2 trumpets and 2 trombones | Michel Rondeau | 
| view | Complete | 4 viols | Albert Folop | 
| Details | Section | Type | Publisher | Date | File | 
|---|---|---|---|---|---|
| view | Complete | Arrangement for 4 recorders | — | — | Complete Score (SATB, in G) · view Complete Score (treble notation, SATB, in G) · view Complete Score (SATB, in F) · view Complete Score (treble notation, SATB, in F) · view Engraving File (Finale) · view | 
| view | Complete | Arrangement for 2 trumpets and 2 trombones | — | — | Complete Score · view Trumpet 1/2 · view Trombone 1/2 · view Engraving files (Finale) · view | 
| view | Complete | Arrangement for 4 viols | — | — | Complete score (Tr T T B) · view Engraving files (Personal composer) · view Treble viol · view Tenor viol 1, alto clef · view Tenor viol 1, octave treble clef · view Tenor viol 2, alto clef · view Tenor viol 2, octave treble clef · view Bass viol · view | 
| Details | Type | Performers | Arranged for | Files | 
|---|---|---|---|---|
| view | Synthesized | — | Complete performance · file | |
| view | Synthesized | Michel Rondeau (trumpet) and with Marthe Jobidon (trumpet) and Eric Vaillancourt & Steve Guerin (performer) | For 2 Trumpets and 2 Trombones (Rondeau) | Complete performance · file | 
| view | Synthesized | For 4 Recorders (Harmer) | MIDI performance · file | 
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