You can find and download sheet music for this specific sonata through the following platforms:
: Provides public domain scores for Albinoni's Op. 6 collection, which includes Sonata No. 2. Sonata No. 2 in G Minor, Op. 6: I. Grave adagio
The piece you are looking for is the by the Italian Baroque composer Tomaso Albinoni . The first movement is titled "I. Grave adagio" . You can find and download sheet music for