If the subtitles don't match the singing: have the AI use speech recognition to align the start and end time of each lyric line, with the words based on what is actually sung, and list any mismatches to ask you about.

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The subtitles don't match the vocals. Use speech recognition to align the start and end times of each lyric line, and use the words actually sung; list the lines that don't match the lyrics I gave you and ask me about them.