If two tunes have equal number of instances then merging either direction would be okay. It probably would be better to merge towards the more contemporary usage. In this case, though, a search for CASWALL shows that it is also called BEMERTON, which has 21 instances, so both CASWALL and WEM IN LEIDENSTAGEN should be merged into BEMERTON.
I actually knew (in a nether recess of my mind) that BEMERTON should be looked at, but didn't get that far.
When I merged them, I saw that BEMERTON has a field called "Article group i.d." with a value of "0", whereas that field is blank for WEM IN LEIDENSTAGEN (the issue didn't come up with CASWALL). I left the "0" intact, but don't know what that means or whether it might be affected by a merge.
Comments
CASWALL and WEM IN LEIDENSTAGEN
If two tunes have equal number of instances then merging either direction would be okay. It probably would be better to merge towards the more contemporary usage. In this case, though, a search for CASWALL shows that it is also called BEMERTON, which has 21 instances, so both CASWALL and WEM IN LEIDENSTAGEN should be merged into BEMERTON.
Will do (BEMERTON)
I actually knew (in a nether recess of my mind) that BEMERTON should be looked at, but didn't get that far.
When I merged them, I saw that BEMERTON has a field called "Article group i.d." with a value of "0", whereas that field is blank for WEM IN LEIDENSTAGEN (the issue didn't come up with CASWALL). I left the "0" intact, but don't know what that means or whether it might be affected by a merge.