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They always start off with the 2nd movement, and usually run into the 3rd if time permits.
On my last roughly 20 sectors the music has only been played once which, surprisingly, was this Tuesday from LCY to EDI at the peak time of 08.50 but which only 16 passengers enjoyed such was the light loading.
Mid 2022 the music was played on a LHR NCL flight. I complimented/thanked the IFL. Upon asking her why it's 'never' played on boarding these days she expressed surprise saying that she believed it was a compulsory requisite to play it on all boardings. It would be interesting to know what any cabin crew reading this would like to comment.