As for other instruments, using early recordings, the musicologist Robert Philip has documented some changes in how VPO players used vibrato during the mid-20th century, although he also notes differences between the VPO and other orchestras of the era. As was typical of the era, the pre-1945 flutes show "very little vibrato" in recordings "until after World War II... even in the long solo in Mahler's "Das Lied von der Erde" the flautist Bruno Walter in 1936... plays almost without vibrato" except on "a few long notes a delicate medium-speed vibrato"; but "by the late 1940s the flautists... had adopted a gentle medium-speed vibrato". The oboes before the 1940s show "little or no vibrato," but by the late 1940s "the principal oboist had adopted a very delicate fast vibrato ... but he uses it very sparingly." (The cor anglais is, he notes, even in the late 1940s still played "without any vibrato"). The bassoonists "show virtually no bassoon vibrato up to the 1950s".