Michael Haydn's Symphony No. 27 in B-flat major, Opus 1 No. 1, Perger 18, Sherman 27, MH 358, written in Salzburg in 1784, is the first of the B-flat major symphonies attributed to Joseph Haydn in Hoboken's catalog.
Scored for 2 oboes, 2 bassoons, 2 horns and strings, in three movements:
This symphony is the third of four by Michael Haydn to include a slow introduction before the first movement (the others are Symphonies Nos. 21, 22, and 30). All four were written between 1778 and 1785 and attached to symphonies cast in three movements (without minuets).