I’d like to swop reciprocal links for my site at http://www.arranging-composing.com
Interested parties please contact email@example.com and we can agree on wording etc.
Ideally, participating sites would be in a related subject area, which is open to a fairly wide interpretation. E.g. music, in this context, could include publishing, the book trade etc. etc.
Despite the notorious moral laxity of some (most?) of the great musicians, we’d better exclude adult stuff.
I think everyone on Earth knows that lots of incoming links to a site imply it’s popular and relevant. Google and the other searches wish to build a W3 full of interesting stuff, hence their spiders react to the presence of links.