 He served as Liszt's copyist in Weimar in January and February 1844, and he spent 18 months there in 1848 and 1849 at Liszt's instigation.Conradi prepared copies of the initial versions of Liszt's orchestral works, making suggestions on scoring.He also assisted Liszt in assembling a "Programme general" of all the repertory he had played during his virtuoso years.