Between Amplifier and Speaker - Ivor Brown, Electronics & Wireless World, Feb 1995
Making the Best of an Audio Transformer - Norman H. Crowhurst, Audio Engineering, 1953
A great little utility called ResCalc - that calculates series/parallel resistor values for you to get that non-standard value. Written by Mark Lovell and Morgan Jones.
Everything about RFI, ground loops, pin 1 problems etc for audio. An extensive library well worth perusing! Generated and/or collected by Jim Brown at Audio Systems Group
One of the best I/V stage design I ever saw is from Michael Smeedegaard, presented in his # 4326 AES preprint: "Low Input Impedance Current to Voltage conversion circuit for Current-Output DACs"
John Linsley Hoods' Linear AC amplifier Liniac - simple but high performance.
An 'ideal diode' - from Linear technology
A vintage (1963) AES paper by Langevin about IM in tape recorders.
By popular request: here is Barrie Gilberts (in)famous paper Are Opamps really Linear?
Forces in Capacitors: A study on the acoustic emissions due to mechanical vibrations in capacitors caused by magneto- and electrostriction.
Even if one million astronomers believe something, that doesn't make it true - a remarkable story about the human condition. An excerpt from Carl Sagan's "The varieties of scientific experience".