Alfred Hitchcock filmography the run. It also featured the first of his famous cameo appearances. Two years later he directed "Blackmail" (1929) which was his first sound film. In 1935 Hitchcock directed "The 39 Steps". Three years later he directed "The Lady Vanishes," starring Margaret Lockwood and Michael Redgrave. Hitchcock's British films – and many of his early American ones – are often mistakenly believed to be in the public domain. In fact, all of his films are under copyright in the US and UK. Nonetheless, bootlegs of his work continue to be widely disseminated. In 1940, Hitchcock transitioned to Hollywood productions, the
Stereophonic sound year later, MGM started using three tracks instead of one to record the musical selections of movie soundtracks, and very quickly upgraded to four. One track was used for dialogue, two for music, and one for sound effects. The purpose for this form of multitrack recording was to make mixing down to a single optical track easier and was not intended to be a recording for stereophonic purposes. The very first two-track recording MGM made (although released in mono) was "It Never Rains But What It Pours" by Judy Garland, recorded on June 21, 1938, for the movie "Love Finds