 Soon after that, Tellefsen became regarded as one of the outstanding pianists of his time, and was especially admired as an interpreter of Chopin's music.When Chopin died in 1849, Tellefsen took over some of his teacher's pupils, including Jane Stirling.In the 1850s and 1860s, Tellefsen was regarded as a very successful pianist, and he toured several times in England, Sweden, and Norway.