Rex Harrison’s idiosyncratic sprechstimme style and mercurial temperament created a production-level headache that turned into both a feud and a technical breakthrough. Harrison flatly refused to prerecord his musical numbers — he claimed he never spoke a song the same way twice and therefore could not convincingly lip-sync — and he initially balked at lyrics written for the 'You Did It' sequence, forcing a confrontation with director George Cukor. Cukor reportedly threatened to walk if Harrison did not restore the omitted lines; Harrison acquiesced. To accommodate Harrison’s live delivery the sound team, led by George Groves, fitted him with a wireless microphone concealed in his necktie — one of the earliest such uses on a feature film — and the sound department ultimately earned an Academy Award for their inventive solution. The clash encapsulates the on-set tug-of-war between star whims, directorial authority, and technological improvisation.
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