The man from Mercury is nervous, very nervous. You can see it easily enough as he paces around Steve Cropper's TMI Studios in Memphis. Up and down the hall, a few laps around the studio itself, up the stairs and into the control room. With judicious use of the elbows, he's even able to pace among the 30 or so people packed in here. Where's the Killer? Sessions were supposed to start 45 minutes ago; where is he?