Lizard King,
"Crap" is a bit strong. The LM741 is crap. The NJM 2068M is not the best dual opamp out there but its inexpensive and has excellent noise performance and good linearity for the audio frequency range.

Rob B,
The opa627 is an excellent opamp with high slew rate. The opa637 may be a better replacement but you need two opa627's or opa637's to replace one NJM 2068M since its a dual. And you'll have to make up an adapter board which will be a bit of a pain for sure. On the other hand, you should be able to find a dual opamp with better specs that uses the same standard "dual opamp" pinout as the NJM 2068M. If I get a chance, I will look into it some more but, I cant do it right now - heading out to dinner with the wife and she is breathing down my neck!!!