: In 1764, an eight-year-old Wolfgang Amadeus Mozart visited London and met J.C. Bach. The two reportedly played duets together, and Bach’s elegant, "singing" style (exemplified in works like Opp. 1) had a profound and lasting influence on Mozart’s own piano concertos. Technical Context
The query appears to refer to (Opus 1) by Johann Christian Bach , a collection of six harpsichord or piano concertos published in 1763 (often cited alongside his other major early works like Opp. 7 and 13). The Story of Johann Christian Bach's Opp. 1 blank 1 opp 2012 skachat
: A "blank 1" can refer to a flexible film blank made of Oriented Polypropylene (OPP) material used in industrial packaging. : In 1764, an eight-year-old Wolfgang Amadeus Mozart