After all these years, who's there? Why, it's Bill Callahan, the super-sexy solo singer, driving though the front of our house once again in his 90s vintage vehicle - the Smog-mobile! And what's he got there in the passenger seat? Hey, it's the 20th anniversary half-speed master vinyl edition of the Smog classic, Knock Knock, by (we've been over this) Smog! Knock Knock was enough of a tour de force that staging a re-look these twenty years later was a cool no-brainer. With production values at an all-time (for then) high and a team of Chicago-based studio rats (as well as a carefully vetted-and-compenstated singing children's choir) on the case, Knock Knock was the most colorful of Smog albums; a record that played like a real-life opera, a story told in song.