I wanted to share this site with you:
http://www.sg-acoustics.ch/analogue_audio/index.htmlUnlike rod elliot's site it is not very widely known on the internet.
If you don't know which Opamp you should take for your next audio design check this out:
http://www.sg-acoustics.ch/analogue_audio/ic_opamps/pdf/opamp_distortion.pdfIt is pretty actual (2009) and has a good variety of opamps from differen suplliers.
There are also some schematics for audio products (preamps, PSU etc).
Take a look at it, you won't regret it!