You can clone with
The resolve resource allows you to lookup and access API resources when you only know the MuseScore.com URL.
$ curl http://api.musescore.com/services/rest/resolve.xml?url=http://musescore.com/nicolas/scores/583&oauth_consumer_key=your_consumer_key
< HTTP/1.1 302 Moved Temporarily
< Location: http://api.musescore.com/services/rest/score/583.xml?oauth_consumer_key=your_consumer_key
This request will resolve and redirect to the API resource URL for the score http://musescore.com/nicolas/scores/583. Just follow the redirect and you will get the representation you want. The resolver supports URLs for: