Peter Welcker functioned as a music seller, engraver, printer and publisher in London from 1762 until his death in 1775. He published a large amount of music by the leading contemporary composers. On single song sheets his imprint can appear only as his initials “P.W.” or “P. W-k-r.” Generally his imprint lacks his forename.
Upon his death, the business was taken over by his wife, Mary Welcker who continued the practice of only using a surname, making imprints difficult to distinguish from those published by her husband. She died in 1778. Soon after her death the business was taken over by the Welckers’ son-in-law, James Blundell. Robert Bremner is known to have purchased some of Mary Welcker’s plates and music in 1779.
The Welckers’ son, John Welcker, also a music seller, engraver, printer and publisher, apparently started with his parents' firm (early imprints indicated his address at 17 Gerrard Street), and eventually opened a separate publishing firm in London. He went bankrupt by July 1780. The inventory was offered for sale and his brother-in-law, James Blundell took over the address at 10 Haymarket. Welcker then resumed business in August 1780 until the end of 1785.
At some point Welcker began using the numbered street address:
|Bach||6 Keyboard Concertos, Op.1 (W.C 49-54)||1763|
|Ebdon||6 Sonatas for Harpsichord, Violins, and Cello||1765?|
|Arnold||8 Keyboard Sonatas, Op.7||before 1775|
|Raimondi||6 String Trios, Op.1||before 1775|
|Giardini||6 String Trios, Op.17||before 1775|
|Bach||6 Keyboard Sonatas, Op.5 (W.A 1-6)||before 1775|
|Bach||6 Keyboard Concertos, Op.7 (W.C 55-60)||before 1775|
|Kammel||6 String Quartets, Op.4||before 1775|
|Mysliveček||6 String Quartets||1775?|
|Deller||6 Trio Sonatas|
|Stamitz||6 Trios, Op.14||between 1777 and 1780|