12 Concerti a cinque (op. 9) is a collection of concertos by the Italian composer Tomaso Albinoni, published in 1722.
The most famous piece from Albinoni's Opus 9 is the Concerto in D minor for oboe (Opus 9, Number 2). It is known for its slow movement. This concerto is probably the second best-known work of Albinoni after the Adagio in G minor (which was once believed to be a reconstruction based on a fragment by Albinoni). 
The concertos were dedicated to Maximilian II Emanuel, Elector of Bavaria, and were first published by Michel-Charles Le Cène in Amsterdam. It is possible, but not certain, that they were written in the Elector's court during a 1722 visit there by Albinoni during performances of his theatrical compositions. These are perhaps his most recognizable works.
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