Recently posted on ABCusers group:

Noticed that the address of the ABC homepage has changed from www.gre.ac.uk/~c.walshaw/abc to staffweb.cms.gre.ac.uk/~c.walshaw/abc to http://abcnotation.org.uk/

Perhaps a clone can update the various places where the Cat links to that page (useful links, FAQ etc etc). Thanks

WassaiL! V