Sorry - I just have to add this as I've become so used to being massively misunderstood here..

Bob Copper's Grandfather writing all the words of all the songs he knew in a notebook was a 'wheel' event. A really important one - but it was still only of influence within his family and community.

Bob's publication of those songs in print and on record was a 'horse' event - and that's the one that had the influence, because without it they'd still be at the back of a drawer in the sideboard.

See?

BOTH