| Genre Categories | Motets; For 5 voices; For unaccompanied voices; |
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| Work Title | Haec dies |
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| Alternative. Title | (Antiphon) |
| Composer | Byrd, William |
| Opus/Catalogue NumberOp./Cat. No. | T 139 |
| Internal Reference NumberInternal Ref. No. | IWB 304 |
| Librettist | Psalm CVII, Psalm CXVIII |
| Language | Latin |
| Composer Time PeriodComp. Period | Renaissance |
| Piece Style | Renaissance |
| Instrumentation | 5 voices |