The Symphony No. 66 in B flat major (Hoboken I/66) is a symphony by Joseph Haydn. The time of composition is uncertain, with one speculation from around 1775–1776. The symphony is scored for two oboes, two bassoons, two horns and strings.
| Date of composition | 1776 (1775-1776) |
| Type | Symphony |
| Tonality | B-flat Major |
| Catalogue | Hob. I:66 |
| Approx. duration | 30 minutes |
| Spoken language | German |
| Instruments | Orchestra |
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| Autotranslations beta |
Joseph Haydn: Symphonie n°66 en si bémol majeur, Hob. I:66 Franz Joseph Haydn: Sinfonia n. 66 in si bemolle maggiore, Hob. I:66 Joseph Haydn: Sinfonie Nr. 66 B-dur, Hob. I:66 |