That eerie warble on Merry Clayton’s 'Gimme Shelter' vocal came from deliberately misusing a tape machine

During the mix of “Gimme Shelter,” engineer Glyn Johns needed something unsettling to match the apocalyptic feel of the track. He got it by running Merry Clayton’s vocal through a second tape machine that was deliberately set to a different speed—probably running at 7.5 ips instead of 15, or with the varispeed slightly off. That mismatch introduced a natural wow and flutter, bending the pitch up and down in a slow, seasick wobble.

The effect is especially noticeable on the line “Rape, murder!” where Clayton’s voice seems to drift out of tune without losing intensity. Johns didn