Seedo was a son of Samuel Peter Sidow, a musician employed by the Elector of Brandenburg.
On 27 September 1727 he married the singer Maria Manina, who had small parts in London's Italian operas beginning in 1711, including Handel's Teseo.
The work was given regular London performances until well into the 19th century and a translation by C. W. von Borcke made it popular in Austria and the German states as well.
He also composed the ballad opera The Lottery with librettist Henry Fielding in 1732.
[2][3] "Mr Seedo" was also an organist and organ composer in London during the first part of the 18th century; some of his organ Voluntaries are preserved in the John Reading Manuscripts of Dulwich College, London,[4] and have been recorded.