green day had uploaded a video of the recording of 1981, and apparently the bass track was done in a single take. here is a higher quality track of the sick bassline
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https://www.youtube.com/watch?v=QMdt3uiSI3E
i managed to archive this, but there are sadly many lag spikes, but before the fire there is no interference with the tape.
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https://www.youtube.com/watch?v=25JUFlytwb0