Waltzes, Composed for and Performed by the Band of Messrs Michau, Musard & Collinet, (Chief of the Orchestra at the Balls of the Court of France), and Performed at Almack's, Argyll Rooms, &c, Arranged by Mr Musard. Book 1.
By the 1820s Philippe Musard was almost as well known for his Waltz publications as he was for his sets of Quadrilles. This was his first collection of Waltzes to be published in London, issued in 1818. He went on to publish at least 31 such books in an ordered sequence spanning the 1820s (the 27th number was advertised from mid 1829). Musard began a convention of naming his Waltzes from the 1821 6th set forwards, generally in tribute to the celebrity dancers of London's elite assembly rooms, the waltzes in this initial collection remain unnamed.
This set were registered for copyright purposes at Stationer's Hall on the 3rd September 1818.
The Waltz dance had been steadily growing in popularity in England since the 1790s, the tipping point for general acceptance can arguably be traced to the visit of the Allied Monarchs to London in mid 1814; Musard didn't bring the Waltz to London, but he was influential in defining how the Waltz was experienced, especially in the 1820s. For further information on the Regency Waltz see: https://www.regencydances.org/paper013.php .